function_exists — Return TRUE if the given function has been defined

• 조회수 4,511
• 작성일 2009-08-30
•  

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/>";
}

• Comment 2010-05-01

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