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Summary of methods for storing arrays as text files in php_php tips

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Release: 2016-05-16 20:05:41
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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

<&#63;php 
$file='./cache/phone.php'; 
$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large')); 
//缓存 
if(false!==fopen($file,'w+')){ 
  file_put_contents($file,serialize($array));//写入缓存 
} 
//读出缓存 
$handle=fopen($file,'r'); 
$cacheArray=unserialize(fread($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

<&#63;php 
$file='./cache/phone.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; 
  $cachetext="<&#63;php\r\n".'$'.$var.'='.arrayeval($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)&#63;'\''.addcslashes($key,'\'\\').'\'':$key; 
    $val=!is_array($val)&&(!preg_match('/^\-&#63;\d+$/',$val)||strlen($val) > 12)&#63;'\''.addcslashes($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; 
  } 
} 
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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

<&#63;php 
$file='./cache/phone.php'; 
$array=array('color'=> array('blue','red','green'),'size'=> array('small','medium','large')); 
//缓存 
$text='<&#63;php $rows='.var_export($array,true).';'; 
if(false!==fopen($file,'w+')){ 
  file_put_contents($file,$text); 
}else{ 
  echo '创建失败'; 
} 
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以上就是为大家介绍的三种php将数组保存为文本格式的方法,希望对大家的学习有所帮助。

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