PHP 文件读入到数组

function file2array($filename){    
    // read a file into an array
    // each element of the array is a line of file
    // also use explode("\r\n", file_get_contents($filename))
    $f = fopen($filename,"r") or die("Unable to open the file '" . $filename . "'!");
    $array=array();
    while(!feof($f)) {
  array_push($array, str_replace("\r\n","",fgets($f)));
}
fclose($f);
return $array;
}

str_replace("\r\n","",fgets($f))

explode("\r\n", file_get_contents($filename))

function array2file($array, $filename, $mode="w"){
    // write an array (1-dim) in a file
    $f = fopen($filename, $mode) or die("Unable to open the file '" . $filename . "'!");
    // $f = savefopen($filename, $mode);
    if (! empty($array)) {
        $first=array_shift($array);
        fwrite($f, $first);
        foreach ($array as $line) {
            fwrite($f, "\r\n" . $line);
        }
    }
    fclose($f);
}

function file2str($filename){    
    // read a file into a string
    $f = fopen($filename,"r");
    $str="";
    while(!feof($f)) {
  $str .= fgets($f);
}
fclose($f);
return $str;
}


function fpush($filename, $arr){
    $f=fopen($filename, "a");
    foreach ($arr as $str) {
        fwrite($f, NL . $str);   // NL == "\r\n"
    }
    fclose($f);
}


function fnl($filename){
    // add a new line "\r\n" in the file
    $f=fopen($filename, "a");
    fwrite($f, NL);  
    fclose($f);
}


function fclear($filename){
    // clear a file
    file_put_contents($filename, "");
}


function fempty($filename){
    // is the file empty or not?
    $f = fopen($filename,"r");
    fgetc($f);
    if (feof($f)) {
        return True;}
    else {
        return False;}
    fclose($f);
}