php教程

Imagick::valid

(PECL imagick 2.0.0)

Imagick::validChecks if the current item is valid

说明

Imagick::valid ( void ) : bool

Checks if the current item is valid.

返回值

成功时返回 TRUE

User Contributed Notes

hyrumt at mediarain dot com 11-Feb-2010 11:01
We found this method to be of value when checking most image file types. However, it does not appear to be rigorous enough to detect corrupt jpg files. We use the following for jpgs and validate() for everything else.

<?php
   
// check for the existence of the EOI segment header at the end of the file
   
if (0 !== fseek($file, -2, SEEK_END) || "\xFF\xD9" !== fread($file, 2)) {
       
fclose($file);
        return
FALSE;
    }
?>

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