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php将数组储存的方法总结

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Release: 2016-06-20 13:01:36
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php 缓存数组形式的变量,实际上就是将 php 将数组写入到一个文本文件或者后缀名为 .php 存储起来,使用的时候直接调用这个文件。

那么如何使用 php 将数组保存为文本格式的文件呢?

下面分享三种方法实现将 php 数组写入到文件以缓存数组。

(1)利用 serialize 将数组序列化存储为文本文件,调用时候再使用 unserialize 还原

<p><?php</p>$file='./cache/phone.php';<br />$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large'));<br />//缓存<br />if(false!==fopen($file,'w+')){<br />	file_put_contents($file,serialize($array));//写入缓存<br />}<br />//读出缓存<br />$handle=fopen($file,'r');<br /><p>$cacheArray=unserialize(fread($handle,filesize($file)));
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(2)自创的将数组保存为标准的数组格式,虽然保存时复杂了点但是调用时简单

<p><?php</p>$file='./cache/phone.php';<br />$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large'));<br />cache_write($file,$array,'rows',false);<br /><br />//写入<br />function cache_write($filename,$values,$var='rows',$format=false){ <br />	$cachefile=$filename;<br />	$cachetext="<?php\r\n".'$'.$var.'='.arrayeval($values,$format).";";<br />	return writefile($cachefile,$cachetext);<br />}<br /><br />//数组转换成字串 <br />function arrayeval($array,$format=false,$level=0){ <br />	$space=$line='';<br />	if(!$format){<br />		for($i=0;$i<=$level;$i++){ <br />			$space.="\t";<br />		}<br />		$line="\n";<br />	}<br />	$evaluate='Array'.$line.$space.'('.$line;<br />	$comma=$space;<br />	foreach($array as $key=> $val){ <br />		$key=is_string($key)?'\''.addcslashes($key,'\'\\').'\'':$key;<br />		$val=!is_array($val)&&(!preg_match('/^\-?\d+$/',$val)||strlen($val) > 12)?'\''.addcslashes($val,'\'\\').'\'':$val;<br />		if(is_array($val)){ <br />			$evaluate.=$comma.$key.'=>'.arrayeval($val,$format,$level+1);<br />		}else{<br />			$evaluate.=$comma.$key.'=>'.$val;<br />		}<br />		$comma=','.$line.$space;<br />	}<br />	$evaluate.=$line.$space.')';<br />	return $evaluate;<br />}<br /><br />//写入文件<br />function writefile($filename,$writetext,$openmod='w'){ <br />	if(false!==$fp=fopen($filename,$openmod)){ <br />		flock($fp,2);<br />		fwrite($fp,$writetext);<br />		fclose($fp);<br />		return true;<br />	}else{<br />		return false;<br />	}<br /><p>}
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(3)利用 var_export 将数组直接保存为数组形式存储到文本文件中

<p><?php</p>$file='./cache/phone.php';<br />$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large'));<br />//缓存<br />$text='<?php $rows='.var_export($array,true).';';<br />if(false!==fopen($file,'w+')){<br />	file_put_contents($file,$text);<br />}else{<br />	echo '创建失败';<br />}
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