php创建目录等函数测试

<?php
	function($test){
		$length=strlen($test);
		$result='';
		for ($i=0; $i < $length; $i++) { 
			$result=$str[$i].$result;
		}
		return $result;
	}

	function checkDate($date){
		if($date==date("Y-m-d H:i:s" , strtotime($date))){
			echo "success";
		}else{
			echo "failure";
		}
	}

	function mkDir($dir,$mode=0777){
		if(is_dir($dir)){
			echo "$dir is exist";
		}else{
			if(mkdir($dir,$mode,true)){
				echo "mkdir success";
			}else{
				echo "mkdir failure";
			}
		}
	}

	function getDays($date=''){
		if($date!=''){
			$date=strtotime($date);
		}else{
			$date=time();
		}
		$days=date('j',$date);
		$result=strtotime("-{$days} days",$date);
		return date('Y-m-d',$result);
	}


	function getNumber($date){
		$date=strrev($date);
		$length=strlen($date);
		$result=0;
		for($i=0;$i<$length;$i++){
			$result+=pow(2, $i)*$date[$i];
		}
		return $result;
	}


	function reSort($date,$parent_id=0,$level=0){
		static $list=array();
		foreach ($date as $key => $value) {
			if($value['id']==$parent_id){
				$list['level']=$level;
				$list[]=$value;
				unset($date[$key]);
				reSort($date,$value['id'],$level+1);
			}
		}
	}


	function getMaxNumber($a,$b,$c){
		return (a>b?a:b)>c?(a>b?a:b):c;
	}

	pattern='/-(\w)/em';
	preg_replace($pattern, "strtoupper('\\1')", $subject);
?>