如果函数的名称有规律,例如gd库的 imagegif,imagepng,imagejpeg函数
$function = sprintf("image%s", 'png');
$fcnction();
$functions = array('gif','png','jpeg');
foreach($functions as $f){
$function = sprintf("image%s", $f);
$function();
}
$function = sprintf("image%s", 'png');
$fcnction();
$functions = array('gif','png','jpeg');
foreach($functions as $f){
$function = sprintf("image%s", $f);
$function();
}

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