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(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
apache_setenv — Set an Apache subprocess_env variable
apache_setenv(string $variable, string $value, bool $walk_to_top = false): bool
apache_setenv()
sets the value of the Apache environment variable specified by
variable
.
Note :
When setting an Apache environment variable, the corresponding $_SERVER variable is not changed.
variable
The environment variable that's being set.
value
The new
variable
value.
walk_to_top
Whether to set the top-level variable available to all Apache layers.
Returns
true
on success or
false
on failure.
Example #1 Setting an Apache environment variable using apache_setenv()
<?php
apache_setenv("EXAMPLE_VAR", "Example Value");
?>
Note :
apache_setenv() can be paired up with apache_getenv() across separate pages or for setting variables to pass to Server Side Includes (.shtml) that have been included in PHP scripts.
(PHP 4, PHP 5, PHP 7, PHP 8)
getallheaders — Fetch all HTTP request headers
getallheaders(): array
Fetches all HTTP headers from the current request.
This function is an alias for apache_request_headers() . Please read the apache_request_headers() documentation for more information on how this function works.
This function has no parameters.
An associative array of all the HTTP headers in the current request, or
false
on failure.
| Version | Description |
|---|---|
| 7.3.0 | This function became available in the FPM SAPI. |
Example #1 getallheaders() example
<?php
foreach (getallheaders() as $name => $value) {
echo "$name: $value\n";
}
?>
(PHP 4, PHP 5, PHP 7, PHP 8)
virtual — Perform an Apache sub-request
virtual(string $uri): bool
virtual()
is an Apache-specific function which is similar to
<!--#include virtual...-->
in
mod_include
. It performs an Apache sub-request. It is useful for including CGI scripts or
.shtml
files, or anything else that you would parse through Apache. Note that for a CGI script, the script must generate valid CGI headers. At the minimum that means it must generate a
Content-Type
header.
To run the sub-request, all buffers are terminated and flushed to the browser, pending headers are sent too.
This function is supported when PHP is installed as an Apache module webserver.
uri
The file that the virtual command will be performed on.
Performs the virtual command on success, or returns
false
on failure.
See apache_note() for an example.
The query string can be passed to the included file but $_GET is copied from the parent script and only $_SERVER['QUERY_STRING'] is filled with the passed query string. The query string may only be passed when using Apache 2. The requested file will not be listed in the Apache access log.
Note :
Environment variables set in the requested file are not visible to the calling script.
Note :
This function may be used on PHP files. However, it is typically better to use include or require for PHP files.
(PECL apcu >= 4.0.0)
apcu_add — Cache a new variable in the data store
apcu_add(string $key, mixed $var, int $ttl = 0): bool
apcu_add(array $values, mixed $unused = NULL, int $ttl = 0): array
Caches a variable in the data store, only if it's not already stored.
Note : Unlike many other mechanisms in PHP, variables stored using apcu_add() will persist between requests (until the value is removed from the cache).
key
Store the variable using this name.
key
s are cache-unique, so attempting to use
apcu_add()
to store data with a key that already exists will not overwrite the existing data, and will instead return
false
. (This is the only difference between
apcu_add()
and
apcu_store()
.)
var
The variable to store
ttl
Time To Live; store
var
in the cache for
ttl
seconds. After the
ttl
has passed, the stored variable will be expunged from the cache (on the next request). If no
ttl
is supplied (or if the
ttl
is
0
), the value will persist until it is removed from the cache manually, or otherwise fails to exist in the cache (clear, restart, etc.).
values
Names in key, variables in value.
Returns TRUE if something has effectively been added into the cache, FALSE otherwise. Second syntax returns array with error keys.
Example #1 A apcu_add() example
<?php
$bar = 'BAR';
apcu_add('foo', $bar);
var_dump(apcu_fetch('foo'));
echo "\n";
$bar = 'NEVER GETS SET';
apcu_add('foo', $bar);
var_dump(apcu_fetch('foo'));
echo "\n";
?>
The above example will output:
string(3) "BAR" string(3) "BAR"
(PECL apcu >= 4.0.0)
apcu_cache_info — Retrieves cached information from APCu's data store
apcu_cache_info(bool $limited = false): array|false
Retrieves cached information and meta-data from APC's data store.
limited
If
limited
is
true
, the return value will exclude the individual list of cache entries. This is useful when trying to optimize calls for statistics gathering.
Array of cached data (and meta-data) or
false
on failure
Note : apcu_cache_info() will raise a warning if it is unable to retrieve APC cache data. This typically occurs when APC is not enabled.
| Version | Description |
|---|---|
| PECL apcu 3.0.11 |
The
limited
parameter was introduced.
|
| PECL apcu 3.0.16 |
The "
filehits
" option for the
cache_type
parameter was introduced.
|
Example #1 A apcu_cache_info() example
<?php
print_r(apcu_cache_info());
?>
The above example will output something similar to:
Array
(
[num_slots] => 2000
[ttl] => 0
[num_hits] => 9
[num_misses] => 3
[start_time] => 1123958803
[cache_list] => Array
(
[0] => Array
(
[filename] => /path/to/apcu_test.php
[device] => 29954
[inode] => 1130511
[type] => file
[num_hits] => 1
[mtime] => 1123960686
[creation_time] => 1123960696
[deletion_time] => 0
[access_time] => 1123962864
[ref_count] => 1
[mem_size] => 677
)
[1] => Array (...iterates for each cached file)
)
(PECL apcu >= 4.0.0)
apcu_cas — Updates an old value with a new value
apcu_cas(string $key, int $old, int $new): bool
apcu_cas()
updates an already existing integer value if the
old
parameter matches the currently stored value with the value of the
new
parameter.
key
The key of the value being updated.
old
The old value (the value currently stored).
new
The new value to update to.
Returns
true
on success or
false
on failure.
Example #1 apcu_cas() example
<?php
apcu_store('foobar', 2);
echo '$foobar = 2', PHP_EOL;
echo '$foobar == 1 ? 2 : 1 = ', (apcu_cas('foobar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
echo '$foobar == 2 ? 1 : 2 = ', (apcu_cas('foobar', 2, 1) ? 'ok' : 'fail'), PHP_EOL;
echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;
echo '$f__bar == 1 ? 2 : 1 = ', (apcu_cas('f__bar', 1, 2) ? 'ok' : 'fail'), PHP_EOL;
apcu_store('perfection', 'xyz');
echo '$perfection == 2 ? 1 : 2 = ', (apcu_cas('perfection', 2, 1) ? 'ok' : 'epic fail'), PHP_EOL;
echo '$foobar = ', apcu_fetch('foobar'), PHP_EOL;
?>
The above example will output something similar to:
$foobar = 2 $foobar == 1 ? 2 : 1 = fail $foobar == 2 ? 1 : 2 = ok $foobar = 1 $f__bar == 1 ? 2 : 1 = fail $perfection == 2 ? 1 : 2 = epic fail $foobar = 1