PHP Chinese string interception skills: Say goodbye to mb_substr()

In PHP development, we often encounter situations where Chinese strings need to be intercepted. Traditionally, we usually use the mb_substr() function to handle the interception of Chinese characters, but its performance is poor and not readable enough. This article will introduce some new Chinese string interception techniques, let us say goodbye to mb_substr(), and improve code efficiency and readability.

Use regular expressions to intercept Chinese strings

Using regular expressions to intercept Chinese strings is an efficient and concise method. We can match Chinese characters through regular expressions and then intercept them.

function chinese_substr($str, $start, $length) {
    preg_match_all("/[x{4e00}-x{9fa5}]/u", $str, $matches);
    $chinese_chars = $matches[0];
    
    return implode('', array_slice($chinese_chars, $start, $length));
}

// Example
$str = "This is a Chinese string";
$result = chinese_substr($str, 2, 4);
echo $result; // Output: a Chinese 

Use mb_substr() with regular expressions

We can also use mb_substr() with regular expressions to intercept Chinese strings, which can handle various situations more flexibly.

function chinese_substr_mb($str, $start, $length) {
    preg_match_all("/./us", $str, $matches);
    $chars = $matches[0];
    
    return mb_substr(implode('', $chars), $start, $length, 'utf-8');
}

// Example
$str = "This is a Chinese string";
$result = chinese_substr_mb($str, 2, 4);
echo $result; // Output: a Chinese

Use a custom function to process Chinese string interception

In order to further simplify the code, we can encapsulate a general Chinese string interception function to facilitate Called in many places in the project.

function chinese_substr_custom($str, $start, $length) {
    $chars = preg_split('//u', $str, null, PREG_SPLIT_NO_EMPTY);
    
    return implode('', array_slice($chars, $start, $length));
}

// Example
$str = "This is a Chinese string";
$result = chinese_substr_custom($str, 2, 4);
echo $result; // Output: a Chinese 

summary

Through the above techniques, we can handle the interception of Chinese strings elegantly and get rid of mb_substr() bondage. Choosing the appropriate method can improve code efficiency and readability, making us more comfortable in PHP development.

I hope the Chinese string interception techniques provided in this article will be helpful to you and make your code more elegant and efficient.

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