PHP data structure: string processing skills, master efficient string operations and matching

Master PHP string processing skills to improve development efficiency, including: 1. Use the . operator to connect strings; 2. Use the substr() function to intercept substrings; 3. Use the str_replace() function to replace substrings; 4. Use the preg_match() function to match strings using regular expressions; 5. Use the glob() function to match file names.

PHP data structure: string processing skills

Master efficient string operations and matching skills to improve PHP development efficiency.

String operations

Connecting strings

• Use the . operator to connect strings:

  $str1 = "Hello";
  $str2 = " world";
  $result = $str1 . $str2; // 结果："Hello world"

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Intercept substring

• Use the substr() function to intercept the specified position from the specified position Substring of length:

  $str = "Hello, world!";
  $result = substr($str, 7, 5); // 结果："world"

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Replace substring

• Use str_replace() function Replace a substring in a string:

  $str = "Hello, world!";
  $result = str_replace("world", "PHP", $str); // 结果："Hello, PHP!"

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String match

Regular expression match

• Use preg_match() The function uses regular expressions to match strings:

  $str = "123-456-7890";
  if (preg_match("/^\d{3}-\d{3}-\d{4}$/", $str)) {
    // 匹配成功
  }

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glob() function

• Use glob() Function to match file name:

  $files = glob("*.php"); // 匹配当前目录中的所有 PHP 文件

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Practical case

Verify email address

function validateEmail($email) {
    return preg_match("/^[\w\.-]+@[\w\.-]+\.\w{2,}$/", $email);
}

Extract website domain name

function extractDomain($url) {
    preg_match("/^https?:\/\/[^\/]+/", $url, $matches);
    return $matches[0];
}

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