How to use complex object as keys in associative arrays in PHP?
0
I would like to get values for a collection of values:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[$a] = 42;
>>> echo $data[$b]
42
I tried with SplObjectStorage, but I need to convert $a into an object and in this case $a != $b because they are different instances:
$s = new SplObjectStorage()
$s[$a] = 42
echo $s[$b]
UnexpectedValueException with message 'Object not found'
How can I achieve this in PHP?
In Python I would have used:
>>> a = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> b = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> data[a] = 42
>>> print(data[b])
42
EDIT
One not very efficient working solution would be:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[serialize($a)] = 42;
>>> echo $data[serialize($b)]
42
php associative-array
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
add a comment |
0
I would like to get values for a collection of values:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[$a] = 42;
>>> echo $data[$b]
42
I tried with SplObjectStorage, but I need to convert $a into an object and in this case $a != $b because they are different instances:
$s = new SplObjectStorage()
$s[$a] = 42
echo $s[$b]
UnexpectedValueException with message 'Object not found'
How can I achieve this in PHP?
In Python I would have used:
>>> a = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> b = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> data[a] = 42
>>> print(data[b])
42
EDIT
One not very efficient working solution would be:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[serialize($a)] = 42;
>>> echo $data[serialize($b)]
42
php associative-array
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
That because the$aand$bare not the same (notice that$a !== $bas you mention) - so they not represent same key on theSplObjectStorage- so I guess it is the expected output
– dWinder
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10
add a comment |
0
0
0
I would like to get values for a collection of values:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[$a] = 42;
>>> echo $data[$b]
42
I tried with SplObjectStorage, but I need to convert $a into an object and in this case $a != $b because they are different instances:
$s = new SplObjectStorage()
$s[$a] = 42
echo $s[$b]
UnexpectedValueException with message 'Object not found'
How can I achieve this in PHP?
In Python I would have used:
>>> a = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> b = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> data[a] = 42
>>> print(data[b])
42
EDIT
One not very efficient working solution would be:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[serialize($a)] = 42;
>>> echo $data[serialize($b)]
42
php associative-array
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
I would like to get values for a collection of values:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[$a] = 42;
>>> echo $data[$b]
42
I tried with SplObjectStorage, but I need to convert $a into an object and in this case $a != $b because they are different instances:
$s = new SplObjectStorage()
$s[$a] = 42
echo $s[$b]
UnexpectedValueException with message 'Object not found'
How can I achieve this in PHP?
In Python I would have used:
>>> a = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> b = (1, 1, 2, 3, 5, Foo, 'o_o', hashable_object)
>>> data[a] = 42
>>> print(data[b])
42
EDIT
One not very efficient working solution would be:
>>> class Foo() {}
>>> $v = (object)[42];
>>> $a = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $b = [1, 1, 2, 3, 5, Foo::class, 'o_o', $v]
>>> $data[serialize($a)] = 42;
>>> echo $data[serialize($b)]
42
php associative-array
php associative-array
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
edited Nov 25 '18 at 13:29
nowox
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
asked Nov 25 '18 at 13:21
nowoxnowox
6,208932102
6,208932102
That because the$aand$bare not the same (notice that$a !== $bas you mention) - so they not represent same key on theSplObjectStorage- so I guess it is the expected output
– dWinder
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10
add a comment |
That because the$aand$bare not the same (notice that$a !== $bas you mention) - so they not represent same key on theSplObjectStorage- so I guess it is the expected output
– dWinder
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10
That because the
$a and $b are not the same (notice that $a !== $b as you mention) - so they not represent same key on the SplObjectStorage - so I guess it is the expected output– dWinder
Nov 25 '18 at 13:45
That because the
$a and $b are not the same (notice that $a !== $b as you mention) - so they not represent same key on the SplObjectStorage - so I guess it is the expected output– dWinder
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10
add a comment |
2 Answers
2
active
oldest
votes
1
According to php manual arrays and objects cannot be used as array keys.
What you could do is this:
>>> class Foo {}
>>> $test = new stdClass();
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])} = 42;
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])};
=> 42
What i was going to do is this:
$test->something = [ 42 => [1, 1, 2, 3, 5, Foo::class, 'o_o']];
array_search([1, 1, 2, 3, 5, Foo::class, 'o_o'], $test->something, true);
=> 42
I hope it helps.
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
Not sure it is more efficient than usingserialize
– nowox
Nov 25 '18 at 13:57
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
add a comment |
0
By looking at the PHP doc I found 'DsMap' available from PECL. With this you can write:
$map = new DsMap();
$v = (object)[41];
$a = [1, 1, 2, 3, 5, 'o_o', $v];
$b = [1, 1, 2, 3, 5, 'o_o', $v];
$map[$a] = 42;
var_dump($map[$b]);
I also looked at the implementation:
https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_htable.c
The zval is hashed with this function
static uint32_t get_array_hash(zval *array)
{
uint32_t hash;
php_serialize_data_t var_hash;
smart_str buffer = {0};
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&buffer, array, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
smart_str_0(&buffer);
if (buffer.s) {
hash = get_string_hash(buffer.s);
zend_string_free(buffer.s);
} else {
hash = 0;
}
return hash;
}
So behind the scene it is the serialize function that is used. I feel a bit sad about this. So your inefficient function will be not much inefficient at the end.
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
1
According to php manual arrays and objects cannot be used as array keys.
What you could do is this:
>>> class Foo {}
>>> $test = new stdClass();
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])} = 42;
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])};
=> 42
What i was going to do is this:
$test->something = [ 42 => [1, 1, 2, 3, 5, Foo::class, 'o_o']];
array_search([1, 1, 2, 3, 5, Foo::class, 'o_o'], $test->something, true);
=> 42
I hope it helps.
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
Not sure it is more efficient than usingserialize
– nowox
Nov 25 '18 at 13:57
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
add a comment |
1
According to php manual arrays and objects cannot be used as array keys.
What you could do is this:
>>> class Foo {}
>>> $test = new stdClass();
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])} = 42;
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])};
=> 42
What i was going to do is this:
$test->something = [ 42 => [1, 1, 2, 3, 5, Foo::class, 'o_o']];
array_search([1, 1, 2, 3, 5, Foo::class, 'o_o'], $test->something, true);
=> 42
I hope it helps.
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
Not sure it is more efficient than usingserialize
– nowox
Nov 25 '18 at 13:57
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
add a comment |
1
1
1
According to php manual arrays and objects cannot be used as array keys.
What you could do is this:
>>> class Foo {}
>>> $test = new stdClass();
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])} = 42;
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])};
=> 42
What i was going to do is this:
$test->something = [ 42 => [1, 1, 2, 3, 5, Foo::class, 'o_o']];
array_search([1, 1, 2, 3, 5, Foo::class, 'o_o'], $test->something, true);
=> 42
I hope it helps.
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
According to php manual arrays and objects cannot be used as array keys.
What you could do is this:
>>> class Foo {}
>>> $test = new stdClass();
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])} = 42;
>>> $test->{implode([1, 1, 2, 3, 5, Foo::class, 'o_o'])};
=> 42
What i was going to do is this:
$test->something = [ 42 => [1, 1, 2, 3, 5, Foo::class, 'o_o']];
array_search([1, 1, 2, 3, 5, Foo::class, 'o_o'], $test->something, true);
=> 42
I hope it helps.
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
answered Nov 25 '18 at 13:56
Vaggelis KspsVaggelis Ksps
19119
19119
Not sure it is more efficient than usingserialize
– nowox
Nov 25 '18 at 13:57
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
add a comment |
Not sure it is more efficient than usingserialize
– nowox
Nov 25 '18 at 13:57
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
Not sure it is more efficient than using
serialize– nowox
Nov 25 '18 at 13:57
Not sure it is more efficient than using
serialize– nowox
Nov 25 '18 at 13:57
1
1
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
According @Peon 's comment here Implode 2 elements: 1.8937180042267 seconds, Implode 4 elements: 2.4380650520325 seconds, Implode 8 elements: 3.6058769226074 seconds Not exactly two times, but close to it, while serialize changes with the same progression type, but slower rate. So i think serialize is faster and it is up to you man and always add the full path of the function for better performance. For example array_search()
– Vaggelis Ksps
Nov 25 '18 at 14:05
add a comment |
0
By looking at the PHP doc I found 'DsMap' available from PECL. With this you can write:
$map = new DsMap();
$v = (object)[41];
$a = [1, 1, 2, 3, 5, 'o_o', $v];
$b = [1, 1, 2, 3, 5, 'o_o', $v];
$map[$a] = 42;
var_dump($map[$b]);
I also looked at the implementation:
https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_htable.c
The zval is hashed with this function
static uint32_t get_array_hash(zval *array)
{
uint32_t hash;
php_serialize_data_t var_hash;
smart_str buffer = {0};
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&buffer, array, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
smart_str_0(&buffer);
if (buffer.s) {
hash = get_string_hash(buffer.s);
zend_string_free(buffer.s);
} else {
hash = 0;
}
return hash;
}
So behind the scene it is the serialize function that is used. I feel a bit sad about this. So your inefficient function will be not much inefficient at the end.
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
add a comment |
0
By looking at the PHP doc I found 'DsMap' available from PECL. With this you can write:
$map = new DsMap();
$v = (object)[41];
$a = [1, 1, 2, 3, 5, 'o_o', $v];
$b = [1, 1, 2, 3, 5, 'o_o', $v];
$map[$a] = 42;
var_dump($map[$b]);
I also looked at the implementation:
https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_htable.c
The zval is hashed with this function
static uint32_t get_array_hash(zval *array)
{
uint32_t hash;
php_serialize_data_t var_hash;
smart_str buffer = {0};
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&buffer, array, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
smart_str_0(&buffer);
if (buffer.s) {
hash = get_string_hash(buffer.s);
zend_string_free(buffer.s);
} else {
hash = 0;
}
return hash;
}
So behind the scene it is the serialize function that is used. I feel a bit sad about this. So your inefficient function will be not much inefficient at the end.
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
add a comment |
0
0
0
By looking at the PHP doc I found 'DsMap' available from PECL. With this you can write:
$map = new DsMap();
$v = (object)[41];
$a = [1, 1, 2, 3, 5, 'o_o', $v];
$b = [1, 1, 2, 3, 5, 'o_o', $v];
$map[$a] = 42;
var_dump($map[$b]);
I also looked at the implementation:
https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_htable.c
The zval is hashed with this function
static uint32_t get_array_hash(zval *array)
{
uint32_t hash;
php_serialize_data_t var_hash;
smart_str buffer = {0};
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&buffer, array, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
smart_str_0(&buffer);
if (buffer.s) {
hash = get_string_hash(buffer.s);
zend_string_free(buffer.s);
} else {
hash = 0;
}
return hash;
}
So behind the scene it is the serialize function that is used. I feel a bit sad about this. So your inefficient function will be not much inefficient at the end.
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
By looking at the PHP doc I found 'DsMap' available from PECL. With this you can write:
$map = new DsMap();
$v = (object)[41];
$a = [1, 1, 2, 3, 5, 'o_o', $v];
$b = [1, 1, 2, 3, 5, 'o_o', $v];
$map[$a] = 42;
var_dump($map[$b]);
I also looked at the implementation:
https://github.com/php-ds/ext-ds/blob/master/src/ds/ds_htable.c
The zval is hashed with this function
static uint32_t get_array_hash(zval *array)
{
uint32_t hash;
php_serialize_data_t var_hash;
smart_str buffer = {0};
PHP_VAR_SERIALIZE_INIT(var_hash);
php_var_serialize(&buffer, array, &var_hash);
PHP_VAR_SERIALIZE_DESTROY(var_hash);
smart_str_0(&buffer);
if (buffer.s) {
hash = get_string_hash(buffer.s);
zend_string_free(buffer.s);
} else {
hash = 0;
}
return hash;
}
So behind the scene it is the serialize function that is used. I feel a bit sad about this. So your inefficient function will be not much inefficient at the end.
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
answered Nov 25 '18 at 17:59
nowoxnowox
6,208932102
6,208932102
add a comment |
add a comment |
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That because the
$aand$bare not the same (notice that$a !== $bas you mention) - so they not represent same key on theSplObjectStorage- so I guess it is the expected output– dWinder
Nov 25 '18 at 13:45
Indeed, it is the expected output, but I don't know how to answer the question though.
– nowox
Nov 25 '18 at 13:45
Why do you think it is not efficient?
– revo
Nov 25 '18 at 15:10