函数读取数组返回

function read_file($filename = ''){
    $buffer = array();
    $source_file = fopen( $filename, "r" ) or die("Couldn't open $filename");
    while (!feof($source_file)) {
        $buffer[] = fread($source_file, 4096);  // use a buffer of 4KB
    }
    return $buffer;
}

使用缓冲技术读取文件。

$filename = "test.txt";
$source_file = fopen( $filename, "r" ) or die("Couldn't open $filename");
while (!feof($source_file)) {
    $buffer = fread($source_file, 4096);  // use a buffer of 4KB
    $buffer = str_replace($old,$new,$buffer);
    ///
}

这就是我如何处理非常大的文件(测试高达100G)。它比fgets()快

$block =1024*1024;//1MB or counld be any higher than HDD block_size*2
if ($fh = fopen("file.txt", "r")) { 
    $left='';
    while (!feof($fh)) {// read the file
       $temp = fread($fh, $block);  
       $fgetslines = explode("\n",$temp);
       $fgetslines[0]=$left.$fgetslines[0];
       if(!feof($fh) )$left = array_pop($lines);           
       foreach ($fgetslines as $k => $line) {
           //do smth with $line
        }
     }
}
fclose($fh);

有一个file()函数返回文件中包含的行数组。

foreach(file('myfile.txt') as $line) {
   echo $line. "\n";
}

SplFileObject在处理大文件时很有用。

function parse_file($filename)
{
    try {
        $file = new SplFileObject($filename);
    } catch (LogicException $exception) {
        die('SplFileObject : '.$exception->getMessage());
    }
    while ($file->valid()) {
        $line = $file->fgets();
        //do something with $line
    }

    //don't forget to free the file handle.
    $file = null;
}

函数读取数组返回

function read_file($filename = ''){
    $buffer = array();
    $source_file = fopen( $filename, "r" ) or die("Couldn't open $filename");
    while (!feof($source_file)) {
        $buffer[] = fread($source_file, 4096);  // use a buffer of 4KB
    }
    return $buffer;
}