PHP Digital alphabet Mixed Sort ____php

In order to meet the needs of a project, wrote a digital letter mixed sorting Function! Not very concise, but can make a reference.

/** * Numeric string comparison function * * @param <type> $f _CP * @param <type> $l _CP * @return <type>/Function cmp ($f _
    CP, $l _CP) {$f _CP = Strtoupper ($f _cp);

    $l _CP = strtoupper ($l _cp);
    $f _cp_ary = str_split ($f _cp);

    $l _cp_ary = str_split ($l _cp);
    $f _len = count ($f _cp_ary);

    $l _len = count ($l _cp_ary);
        foreach ($f _cp_ary as $index => $char) {$l _tmp_char = isset ($l _cp_ary[$index])? $l _cp_ary[$index]: null;

        if (Is_null ($l _tmp_char)) return 1;

        if ($char = = $l _cp_ary[$index]) continue; if (Isnumber ($char) && isnumber ($l _cp_ary[$index))//processing 2 is a special case of numbers until the back one is not a number {$f _nber = Getar
            Raycurrindexafterallnumber ($f _cp_ary, $index);

            $l _nber = Getarraycurrindexafterallnumber ($l _cp_ary, $index); Return ($f _nber < $l _nber)?
        -1:1;
        } $ord _f = Ord ($char);

        $ord _l = Ord ($l _cp_ary[$index]);
    Return ($ord _f-$ord _l);
return 0;
}
/** * Whether digital, ASCII comparison * * @param <type> $char * @return <type>/function Isnumber ($char) {$ASC _numbe

    R = Ord ($char);
    if ($asc _number >= && $asc <=) return true;
return false; /** * Whether alphabetic, ASCII comparison * * @param <type> $char * @return <type>/function Isletter ($char) {if empty    ($char))
    return false;

    $asc _letter = ord ($char);
    if ($asc _letter >= && $asc _letter <=122) return true;
return false; /** * Gets a continuous number * * @param array $ary * @param <type> $curr _index * @return <type>/function GetArray
    Currindexafterallnumber (array $ary, $curr _index) {$is _number = true;

    $index = $curr _index;
    $ret _number = Array ();  while ($is _number) {$number = Isset ($ary [$index])?
        $ary [$index]: ';
            if (!isnumber ($number)) {$is _number = false;
        Break
        } $ret _number[] = $number;
    + + $index;} $ret = ';
    if (!empty ($ret _number)) $ret = Implode (', $ret _number);
return (int) $ret; }