filemtime() 函数返回文件内容上次的修改时间。
若成功,则时间以 Unix 时间戳的方式返回。若失败,则返回 false。
语法
filemtime(filename)
$path = "a.txt"; if( file_exists( $path ) ){ $filetimes = filemtime($path); $cutime =time(); $uptime = 900;//15分钟生成一次 if ($cutime-$filetimes>$uptime) { $h = fopen( $path,'w+' ); fwrite( $h,'到了更新的时间' ); fclose( $h ); } } else { $h = fopen( $path,'w+' ); fwrite( $h,'文件不存在' ); fclose( $h ); }
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