php 解决file_put_contents 不生效

define('FILE_APPEND', 1); 

if (!function_exists("file_put_contents")) { 

    function file_put_contents($n, $d, $flag = false) { 
        $mode = ($flag == FILE_APPEND || strtoupper($flag) == 'FILE_APPEND') ? 'a' : 'w'; 
        $f = @fopen($n, $mode); 
        if ($f === false) { 
            return 0; 
        } else { 
            if (is_array($d)) $d = implode($d); 
            $bytes_written = fwrite($f, $d); 
            fclose($f); 
            return $bytes_written; 
        } 
    } 

} 

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转载自www.cnblogs.com/gaogaoxingxing/p/10033209.html