Comparison of the use of PHP functions in different situations

Functions in PHP can be used to perform various tasks, including array operations (array_merge(), array_filter()), string operations (strtoupper(), substr()), and time operations (date(), mktime() ), using them can improve development efficiency and code quality.

Comparison of PHP functions in different scenarios

In PHP, functions play a vital role, by using them , you can perform a wide range of tasks and simplify your code. The following are some common PHP functions and their applications in different scenarios:

Array function

• ##array_merge():Merge two or more arrays.
  Example:

  <?php
  $arr1 = array(1, 2, 3);
  $arr2 = array(4, 5, 6);
  $arr3 = array_merge($arr1, $arr2);
  print_r($arr3);  // 输出：Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 [5] => 6 )
  ?>

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• array_filter(): Filter the elements in the array, retaining only those elements that meet the given conditions.
  Example:

  <?php
  $numbers = array(1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
  $odd_numbers = array_filter($numbers, function($n) { return $n % 2 != 0; });
  print_r($odd_numbers);  // 输出：Array ( [0] => 1 [1] => 3 [2] => 5 [3] => 7 [4] => 9 )

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String function

• strtoupper( ): Convert the string to uppercase.
  Example:

  <?php
  $str1 = "Hello, World!";
  $str2 = strtoupper($str1);
  echo $str2;  // 输出：HELLO, WORLD!

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• substr(): Intercept a substring of the specified length from the specified position of the string.
  Example:

  <?php
  $str1 = "Hello, World!";
  $sub_str = substr($str1, 7, 5);
  echo $sub_str;  // 输出：World

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Time function

• date() :Format date and time.
  Example:

  <?php
  echo date('Y-m-d H:i:s');  // 输出：2023-03-08 03:08:58

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• mktime(): Create a Unix timestamp based on parameters.
  Example:

  <?php
  $timestamp = mktime(10, 15, 30, 1, 1, 2023);
  echo date('Y-m-d H:i:s', $timestamp);  // 输出：2023-01-01 10:15:30

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