php 把数组保存为标准的数组格式，存储到文件中

<?php
$file='./test.php';
$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large'));
cache_write($file,$array,'rows',false); 

//写入
function cache_write($filename,$values,$var='rows',$format=false){
  $cachefile=$filename;
  $cachetext="<?php\r\n".'$'.$var.'='.arrayeval($values,$format).";";
  return writefile($cachefile,$cachetext);
} 

//数组转换成字串
function arrayeval($array,$format=false,$level=0){
  $space=$line='';
  if(!$format){
    for($i=0;$i<=$level;$i++){
      $space.="\t";
    }
    $line="\n";
  }
  $evaluate='Array'.$line.$space.'('.$line;
  $comma=$space;
  foreach($array as $key=> $val){
    $key=is_string($key)?'\''.addcslashes($key,'\'\\').'\'':$key;
    $val=!is_array($val)&&(!preg_match('/^\-?\d+$/',$val)||strlen($val) > 12)?'\''.addcslashes($val,'\'\\').'\'':$val;
    if(is_array($val)){
      $evaluate.=$comma.$key.'=>'.arrayeval($val,$format,$level+1);
    }else{
      $evaluate.=$comma.$key.'=>'.$val;
    }
    $comma=','.$line.$space;
  }
  $evaluate.=$line.$space.')';
  return $evaluate;
} 

//写入文件
function writefile($filename,$writetext,$openmod='w'){
  if(false!==$fp=fopen($filename,$openmod)){
    flock($fp,2);
    fwrite($fp,$writetext);
    fclose($fp);
    return true;
  }else{
    return false;
  }
}