HIVE hosting - PHP: function

Руководство по PHP
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Description

bool function_exists ( string function_name)

Checks the list of defined functions, both built-in (internal) and user-defined, for function_name. Возвращает TRUE в случае успешного завершения, FALSE в случае возникновения ошибки.


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

Note that 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). Also note that function_exists() will return FALSE for constructs, such as include_once() and echo().

Пред.	Начало	След.
func_num_args	Уровень выше	get_defined_functions