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Most Referenced Functions » google_pagerank() » preg_replace() » imagecreatefrompng() » site_pageranks() » imagepng() » imagedestroy() » imagestring() » imagecolorallocate() » htmlentities() » fopen() » preg_match() » header() » getimagesize() » htmlspecialchars() » session_start() » ob_start() » strstr() » ob_flush() » preg_match_all() » strpos() » flush() » setcookie() » str_replace() » array2vars() » nl2br() » preg_split() » ereg() » urlencode() » ereg_replace() » readgzfile() Become a sponsor for $15/month. Link is sitewide - PR5 homepage, 20+ PR4 pages, 90+ PR3 pages. Email dave[AT]icemelon[D0T]c0m. |
PHP Functions
Function: function_exists (PHP 3 >= 3.0.7, PHP 4, PHP 5) function_exists -- Return TRUE if the given function has been definedDescriptionbool function_exists ( string function_name )Checks the list of defined functions, both built-in (internal) and user-defined, for function_name . Returns TRUE on success or FALSE on failure.
<?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() . Related Function(s) |