How is stored resource type in php
How stored Resource type in php? Is it string in memory or some structure ?
In documentation
A resource is a special variable, holding a reference to an external
resource.
How it works in php environment?
php c
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
|
show 1 more comment
How stored Resource type in php? Is it string in memory or some structure ?
In documentation
A resource is a special variable, holding a reference to an external
resource.
How it works in php environment?
php c
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
For example a variable storing a MySQL connection result from callingmysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835
– Gary Thomas
Jan 3 at 17:25
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
1
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
1
It's aresourcetype. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.
– Sammitch
Jan 3 at 18:15
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47
|
show 1 more comment
How stored Resource type in php? Is it string in memory or some structure ?
In documentation
A resource is a special variable, holding a reference to an external
resource.
How it works in php environment?
php c
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
How stored Resource type in php? Is it string in memory or some structure ?
In documentation
A resource is a special variable, holding a reference to an external
resource.
How it works in php environment?
php c
php c
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
edited Jan 4 at 11:01
Konstantin Okhotnick
1,337922
1,337922
asked Jan 3 at 17:17
user10863728
For example a variable storing a MySQL connection result from callingmysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835
– Gary Thomas
Jan 3 at 17:25
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
1
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
1
It's aresourcetype. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.
– Sammitch
Jan 3 at 18:15
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47
|
show 1 more comment
For example a variable storing a MySQL connection result from callingmysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835
– Gary Thomas
Jan 3 at 17:25
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
1
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
1
It's aresourcetype. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.
– Sammitch
Jan 3 at 18:15
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47
For example a variable storing a MySQL connection result from calling
mysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835– Gary Thomas
Jan 3 at 17:25
For example a variable storing a MySQL connection result from calling
mysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835– Gary Thomas
Jan 3 at 17:25
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
1
1
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
1
1
It's a
resource type. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.– Sammitch
Jan 3 at 18:15
It's a
resource type. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.– Sammitch
Jan 3 at 18:15
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47
|
show 1 more comment
1 Answer
1
active
oldest
votes
Types in PHP implementation throuth base structure ZVAL.
Every type is structure ZVAL (Zend value).
As we know
A resource is a special variable, holding a reference to an external
resource. Resources are created and used by special functions.
for example fopen return type resurce.
$fp = fopen('/proc/cpuinfo', 'r');
$fp - is Resource type, it means in the php core have created composition data by structure:
struct _zend_resource {
zend_refcounted_h gc;
int handle;
int type;
void *ptr;
};
Where zend_refcounted_h - header of our type, it done for memory managment and represents hash;handleis an integer that is used internally by the engine to locate the resource into an internal resource table. Php create it in process creating resource.
The type is used to regroup resources of the same type together. It means we need call destructor of resource and it helps us to find registered destructor.ptrit is our abstraction data.
Stage creating resource:
1. Registration destructor with zend_register_list_destructors_ex(). it needs for cleaning memory in garbage collector.
2. Register new resource zend_register_resource() and attach pointer to destructor. It is our type that returned zend_register_list_destructors_ex()
full example.
static void file_destructor(zend_resource *rsrc)
{
fclose((FILE *)rsrc->ptr);
}
type = zend_register_list_destructors_ex(
file_destructor, // pointer to destructor
NULL, // pointer to destructor for persistent resource, that non deleted after end request (example BD connection resource)
"file_resource", // name
module_number // PHP extension number
);
fp = fopen("/proc/cpuinfo", "r");
file_resource = zend_register_resource((void *)fp, type);
ZVAL_RES(&my_val, file_resource);
Resource types are just a way for the engine to mix different kind of
resources (of type “file”, “gzip” or even “mysql connection”) into the
same resource table.
More details about Resource type, creating, deleting and working in phpinternalsbook
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
add a comment |
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1 Answer
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1 Answer
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oldest
votes
Types in PHP implementation throuth base structure ZVAL.
Every type is structure ZVAL (Zend value).
As we know
A resource is a special variable, holding a reference to an external
resource. Resources are created and used by special functions.
for example fopen return type resurce.
$fp = fopen('/proc/cpuinfo', 'r');
$fp - is Resource type, it means in the php core have created composition data by structure:
struct _zend_resource {
zend_refcounted_h gc;
int handle;
int type;
void *ptr;
};
Where zend_refcounted_h - header of our type, it done for memory managment and represents hash;handleis an integer that is used internally by the engine to locate the resource into an internal resource table. Php create it in process creating resource.
The type is used to regroup resources of the same type together. It means we need call destructor of resource and it helps us to find registered destructor.ptrit is our abstraction data.
Stage creating resource:
1. Registration destructor with zend_register_list_destructors_ex(). it needs for cleaning memory in garbage collector.
2. Register new resource zend_register_resource() and attach pointer to destructor. It is our type that returned zend_register_list_destructors_ex()
full example.
static void file_destructor(zend_resource *rsrc)
{
fclose((FILE *)rsrc->ptr);
}
type = zend_register_list_destructors_ex(
file_destructor, // pointer to destructor
NULL, // pointer to destructor for persistent resource, that non deleted after end request (example BD connection resource)
"file_resource", // name
module_number // PHP extension number
);
fp = fopen("/proc/cpuinfo", "r");
file_resource = zend_register_resource((void *)fp, type);
ZVAL_RES(&my_val, file_resource);
Resource types are just a way for the engine to mix different kind of
resources (of type “file”, “gzip” or even “mysql connection”) into the
same resource table.
More details about Resource type, creating, deleting and working in phpinternalsbook
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
add a comment |
Types in PHP implementation throuth base structure ZVAL.
Every type is structure ZVAL (Zend value).
As we know
A resource is a special variable, holding a reference to an external
resource. Resources are created and used by special functions.
for example fopen return type resurce.
$fp = fopen('/proc/cpuinfo', 'r');
$fp - is Resource type, it means in the php core have created composition data by structure:
struct _zend_resource {
zend_refcounted_h gc;
int handle;
int type;
void *ptr;
};
Where zend_refcounted_h - header of our type, it done for memory managment and represents hash;handleis an integer that is used internally by the engine to locate the resource into an internal resource table. Php create it in process creating resource.
The type is used to regroup resources of the same type together. It means we need call destructor of resource and it helps us to find registered destructor.ptrit is our abstraction data.
Stage creating resource:
1. Registration destructor with zend_register_list_destructors_ex(). it needs for cleaning memory in garbage collector.
2. Register new resource zend_register_resource() and attach pointer to destructor. It is our type that returned zend_register_list_destructors_ex()
full example.
static void file_destructor(zend_resource *rsrc)
{
fclose((FILE *)rsrc->ptr);
}
type = zend_register_list_destructors_ex(
file_destructor, // pointer to destructor
NULL, // pointer to destructor for persistent resource, that non deleted after end request (example BD connection resource)
"file_resource", // name
module_number // PHP extension number
);
fp = fopen("/proc/cpuinfo", "r");
file_resource = zend_register_resource((void *)fp, type);
ZVAL_RES(&my_val, file_resource);
Resource types are just a way for the engine to mix different kind of
resources (of type “file”, “gzip” or even “mysql connection”) into the
same resource table.
More details about Resource type, creating, deleting and working in phpinternalsbook
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
add a comment |
Types in PHP implementation throuth base structure ZVAL.
Every type is structure ZVAL (Zend value).
As we know
A resource is a special variable, holding a reference to an external
resource. Resources are created and used by special functions.
for example fopen return type resurce.
$fp = fopen('/proc/cpuinfo', 'r');
$fp - is Resource type, it means in the php core have created composition data by structure:
struct _zend_resource {
zend_refcounted_h gc;
int handle;
int type;
void *ptr;
};
Where zend_refcounted_h - header of our type, it done for memory managment and represents hash;handleis an integer that is used internally by the engine to locate the resource into an internal resource table. Php create it in process creating resource.
The type is used to regroup resources of the same type together. It means we need call destructor of resource and it helps us to find registered destructor.ptrit is our abstraction data.
Stage creating resource:
1. Registration destructor with zend_register_list_destructors_ex(). it needs for cleaning memory in garbage collector.
2. Register new resource zend_register_resource() and attach pointer to destructor. It is our type that returned zend_register_list_destructors_ex()
full example.
static void file_destructor(zend_resource *rsrc)
{
fclose((FILE *)rsrc->ptr);
}
type = zend_register_list_destructors_ex(
file_destructor, // pointer to destructor
NULL, // pointer to destructor for persistent resource, that non deleted after end request (example BD connection resource)
"file_resource", // name
module_number // PHP extension number
);
fp = fopen("/proc/cpuinfo", "r");
file_resource = zend_register_resource((void *)fp, type);
ZVAL_RES(&my_val, file_resource);
Resource types are just a way for the engine to mix different kind of
resources (of type “file”, “gzip” or even “mysql connection”) into the
same resource table.
More details about Resource type, creating, deleting and working in phpinternalsbook
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
Types in PHP implementation throuth base structure ZVAL.
Every type is structure ZVAL (Zend value).
As we know
A resource is a special variable, holding a reference to an external
resource. Resources are created and used by special functions.
for example fopen return type resurce.
$fp = fopen('/proc/cpuinfo', 'r');
$fp - is Resource type, it means in the php core have created composition data by structure:
struct _zend_resource {
zend_refcounted_h gc;
int handle;
int type;
void *ptr;
};
Where zend_refcounted_h - header of our type, it done for memory managment and represents hash;handleis an integer that is used internally by the engine to locate the resource into an internal resource table. Php create it in process creating resource.
The type is used to regroup resources of the same type together. It means we need call destructor of resource and it helps us to find registered destructor.ptrit is our abstraction data.
Stage creating resource:
1. Registration destructor with zend_register_list_destructors_ex(). it needs for cleaning memory in garbage collector.
2. Register new resource zend_register_resource() and attach pointer to destructor. It is our type that returned zend_register_list_destructors_ex()
full example.
static void file_destructor(zend_resource *rsrc)
{
fclose((FILE *)rsrc->ptr);
}
type = zend_register_list_destructors_ex(
file_destructor, // pointer to destructor
NULL, // pointer to destructor for persistent resource, that non deleted after end request (example BD connection resource)
"file_resource", // name
module_number // PHP extension number
);
fp = fopen("/proc/cpuinfo", "r");
file_resource = zend_register_resource((void *)fp, type);
ZVAL_RES(&my_val, file_resource);
Resource types are just a way for the engine to mix different kind of
resources (of type “file”, “gzip” or even “mysql connection”) into the
same resource table.
More details about Resource type, creating, deleting and working in phpinternalsbook
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
edited Jan 4 at 9:14
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
answered Jan 3 at 21:23
Konstantin OkhotnickKonstantin Okhotnick
1,337922
1,337922
add a comment |
add a comment |
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For example a variable storing a MySQL connection result from calling
mysqli_connect. To quote: "Resources are created and used by special functions. File and database resources are defined by the PHP interpreter and are only accessible by functions provided by the interpreter" Reference: informit.com/articles/article.aspx?p=680835– Gary Thomas
Jan 3 at 17:25
@GaryThomas yes, you right, i know it. But my question is how generate resource in php Core.
– user10863728
Jan 3 at 17:34
1
I think resources are implemented as integers, and they're indexes into tables in the PHP core.
– Barmar
Jan 3 at 17:44
1
It's a
resourcetype. It's a reference to functionality internal to the PHP engine that is not otherwise accessible to your code. It has no other meaningful structure that you need to be aware of when writing PHP code.– Sammitch
Jan 3 at 18:15
stackoverflow.com/questions/30258470/…
– deceze♦
Jan 3 at 21:47