- function check_img_by_source($source) {
-
- switch(bin2hex(substr($source,0,2))){
- case 'ffd8' : return 'ffd9' === bin2hex(substr($source,-2)); //jpg
- case '8950' : return '6082' === bin2hex(substr($source,-2)); //png
- case '4749' : return '003b' === bin2hex(substr($source,-2)); //gif
- default : return false;
- }
- }
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