A simple implementation of PHP to determine Chinese and numbers in strings

PHP is a widely used server-side scripting language that is flexible, powerful and easy to learn. In the process of using PHP for string processing, it is a common requirement to determine whether a string contains Chinese characters and numbers. This article will introduce how to implement a simple function of determining whether a string contains Chinese characters and numbers in PHP, with specific code examples.

First, let’s take a look at how to determine whether a string contains Chinese characters. The range of Chinese character encoding is: [x{4e00}-x{9fa5}]. Chinese characters can be matched through regular expressions. Next is the code example:

function hasChinese($str)
{
    if (preg_match('/[x{4e00}-x{9fa5}]/u', $str)) {
        return true;
    } else {
        return false;
    }
}

$str = "Hello, 你好";
if (hasChinese($str)) {
    echo "该字符串包含中文";
} else {
    echo "该字符串不包含中文";
}

The above code defines a function hasChinese, which accepts a string parameter and uses the preg_match function to match the regular expression Whether the string contains Chinese characters. If it contains Chinese, it returns true, otherwise it returns false. Then verify the correctness of the function by testing the string "Hello, hello".

Next, let’s look at how to determine whether a string contains numbers. You can match numbers with a simple regular expression. The code example is as follows:

function hasNumber($str)
{
    if (preg_match('/d/', $str)) {
        return true;
    } else {
        return false;
    }
}

$str = "123abc";
if (hasNumber($str)) {
    echo "该字符串包含数字";
} else {
    echo "该字符串不包含数字";
}

The above code defines a function hasNumber to determine whether the string contains numbers. Also use the preg_match function and the simple regular expression d to match numeric characters. Then verify the correctness of the function by testing the string "123abc".

To sum up, through the above simple PHP code example, we can realize the function of determining whether a string contains Chinese characters and numbers. These simple functions can help us process strings more conveniently in actual development and meet actual needs. Hope this article can be helpful to readers.

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