feng-ming · December 13, 2015 20:28
diff --git a/command_exist b/command_exist
 <?php
 //仅仅试用于linux/mac环境
 function command_exist($cmd)
 {
    $returnVal = shell_exec("which $cmd");
    return (empty($returnVal) ? false : true);
 }
	<?php
	//仅仅试用于linux/mac环境
	function command_exist($cmd)
	{
	$returnVal = shell_exec("which $cmd");
	return (empty($returnVal) ? false : true);
	}