php 判断是否包含数字

<?php
function containsNumber($string) {
    return preg_match('/\d/', $string);
}

$string = "Hello World 123";
if (containsNumber($string)) {
    echo "字符串包含数字";
} else {
    echo "字符串不包含数字";
}
?>

<?php
function containsNumber($string) {
    return strpos($string, '0') !== false || strpos($string, '1') !== false || strpos($string, '2') !== false || strpos($string, '3') !== false || strpos($string, '4') !== false || strpos($string, '5') !== false || strpos($string, '6') !== false || strpos($string, '7') !== false || strpos($string, '8') !== false || strpos($string, '9') !== false;
}

$string = "Hello World 123";
if (containsNumber($string)) {
    echo "字符串包含数字";
} else {
    echo "字符串不包含数字";
}
?>