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function exists — Return TRUE if the given function has been defined |
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bool function_exists ( string $function_name )
<?php
if (function_exists('imap_open')) {
echo "IMAP functions are available.<br />\n";
} else {
echo "IMAP functions are not available.<br />\n";
}
?>
if(function_exists("mb_detect_encoding")) {
echo "33333333";
echo "<br/>";
}
http://docs.php.net/manual/kr/function.function-exists.php |
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