php中数据格式判断方法总结

$str = "Hello, World!";
if (strlen($str) > 10) {
    echo "字符串长度大于10";
} else {
    echo "字符串长度小于等于10";
}

$str = "";
if (empty($str)) {
    echo "字符串为空";
} else {
    echo "字符串不为空";
}

$num = "123";
if (is_numeric($num)) {
    echo "是数字";
} else {
    echo "不是数字";
}

$num = 123;
if (is_int($num)) {
    echo "是整数";
} else {
    echo "不是整数";
}

$num = 3.14;
if (is_float($num)) {
    echo "是浮点数";
} else {
    echo "不是浮点数";
}

$value = true;
if (is_bool($value)) {
    echo "是布尔值";
} else {
    echo "不是布尔值";
}

$arr = [1, 2, 3];
if (is_array($arr)) {
    echo "是数组";
} else {
    echo "不是数组";
}

$obj = new stdClass();
if (is_object($obj)) {
    echo "是对象";
} else {
    echo "不是对象";
}

$dateStr = "2022-01-01";
$date = DateTime::createFromFormat('Y-m-d', $dateStr);
if ($date !== false) {
    echo "是有效的日期";
} else {
    echo "不是有效的日期";
}

$email = "test@example.com";
if (filter_var($email, FILTER_VALIDATE_EMAIL)) {
    echo "是有效的邮箱地址";
} else {
    echo "不是有效的邮箱地址";
}

$url = "https://www.example.com";
if (filter_var($url, FILTER_VALIDATE_URL)) {
    echo "是有效的URL";
} else {
    echo "不是有效的URL";
}

$ip = "192.168.0.1";
if (filter_var($ip, FILTER_VALIDATE_IP)) {
    echo "是有效的IP地址";
} else {
    echo "不是有效的IP地址";
}

$phone = "13812345678";
if (preg_match('/^1[3456789]\d{9}$/', $phone)) {
    echo "是有效的手机号码";
} else {
    echo "不是有效的手机号码";
}

$idCard = "110101199001011234";
if (preg_match('/^\d{17}[\dXx]$/', $idCard)) {
    echo "是有效的身份证号码";
} else {
    echo "不是有效的身份证号码";
}

$jsonStr = '{"name":"John","age":30,"city":"New York"}';
$jsonObj = json_decode($jsonStr);
if ($jsonObj !== null) {
    echo "是合法的JSON字符串";
} else {
    echo "不是合法的JSON字符串";
}

$xmlStr = '<root><name>John</name><age>30</age></root>';
$dom = simplexml_load_string($xmlStr);
if ($dom !== false) {
    echo "是合法的XML字符串";
} else {
    echo "不是合法的XML字符串";
}

$postalCode = "100000";
if (preg_match('/^\d{6}$/', $postalCode)) {
    echo "是有效的邮政编码";
} else {
    echo "不是有效的邮政编码";
}

$imageFile = "path/to/image.jpg";
$imageInfo = getimagesize($imageFile);
if ($imageInfo !== false) {
    echo "是有效的图片文件";
} else {
    echo "不是有效的图片文件";
}