International PHP Conference 2015

function_exists

(PHP 4, PHP 5)

function_existsReturn TRUE if the given function has been defined

Descrierea

bool function_exists ( string $function_name )

Checks the list of defined functions, both built-in (internal) and user-defined, for function_name.

Parametri

function_name

The function name, as a string.

Valorile întoarse

Returns TRUE if function_name exists and is a function, FALSE otherwise.

Notă:

This function will return FALSE for constructs, such as include_once and echo.

Exemple

Example #1 function_exists() example

<?php
if (function_exists('imap_open')) {
    echo 
"IMAP functions are available.<br />\n";
} else {
    echo 
"IMAP functions are not available.<br />\n";
}
?>

Note

Notă:

A function name may exist even if the function itself is unusable due to configuration or compiling options (with the image functions being an example).

A se vedea și

add a note add a note

User Contributed Notes

There are no user contributed notes for this page.
To Top