charaster---string单个字符操作

<?php/**  * string single display  * string[i] display method  */// example$string = "this is the just text";$vowels = 0;for($i = 0, $j = strlen($string); $i < $j; $i++) {    if(strstr('this', $string[$i])) {        $vowels++;    }}echo $vowels;echo "<br>";function lookandsay($s) {        $r = '';    $m = $s[0];    $n = 1;    for($i = 1, $j = strlen($s); $i < $j; $i++) {        if($s[$i] == $m) {            $n++;        } else {            $r .= $n . $m;            $m = $s[$i];            $n = 1;         }    }    return $r . $n . $m;}for($i = 0, $s = 1; $i < 10; $i++) {    $s = lookandsay($s);    echo $s;    echo "<br>";    }?>

//其实string单个字符操作就是string[$i]的应用

lookandsay很有意思。值得研究！！