php - 为什么我没有得到相同的输出？

Question

我正在尝试检查字符串是否为 PANGRAM，但两个代码给出了不同的结果。

第一 -

<?php
$line = strtolower(trim("thequickbrownfoxjumpsoverthelazydog"));
$letters = str_split("thequickbrownfoxjumpsoverthelazydog");
$result = "pangram";

foreach ($letters as $value) {
    if (strstr($line, $value) == FALSE) {
        $result = "not pangram";
    }
}
echo $result;
?>

第二名 -

<?php
$line = strtolower(trim("thequickbrownfoxjumpsoverthelazydog"));
$letters = str_split("thequickbrownfoxjumpsoverthelazydog");
$result = "not pangram";
foreach ($letters as $value) {
    if (strstr($line, $value) == TRUE) {
        $result = "pangram";
    }
}

echo $result;
?>

Answer 1

非常简单的全字词检查代码

$string = "The quick brown fox jumps over the lazy dog";
$stringData = str_split(strtolower($string));
$check = range('a', 'z');
$res = array_intersect($check, $stringData);
if(count($check) === count($res)) echo 'panagram';
else echo 'not panagram';

就是这样