How to do fuzzy query on array in PHP

In PHP, array is one of the commonly used data structures. Sometimes, we need to perform fuzzy queries on arrays to find specific data. This article will introduce how to perform fuzzy queries on arrays in PHP.

1. What is fuzzy query

Fuzzy query is a way of querying data in a database or other data storage system. By using wildcards and special characters, you can match data that contains specific patterns.

2. Fuzzy query of PHP array

In PHP, we can use some functions to perform fuzzy query on arrays. Here are some commonly used functions:

• array_filter: This function filters the values ​​in an array and returns a new array. You can use a callback function to define which values ​​to filter.

  Sample code:

  $arr = array('apple', 'banana', 'cherry', 'date');
  $result = array_filter($arr, function($value) {
      return strpos($value, 'a') !== false;
  });
  print_r($result); // 输出array('apple', 'banana');

  In the above code, the array_filter function is used to filter the values ​​​​containing the letter 'a' in the array. The strpos function in the callback function is used to determine whether a string contains another string.

• preg_grep: This function performs a regular expression match on the values ​​in an array and returns a new array containing all matches.

  Sample code:

  $arr = array('001', '002', '003', '011', '012', '013');
  $result = preg_grep("/01[1-3]/", $arr);
  print_r($result); // 输出array('011', '012', '013');

  In the above code, the preg_grep function is used to match the values ​​in the array that start with '01' and end with '1', '2' or '3'.

• array_walk_recursive: This function can traverse all elements in a multi-dimensional array, and a callback function can be used to process each element.

  Sample code:

  $arr = array(
      'fruit' => array('apple', 'banana', 'cherry'),
      'color' => array('red', 'yellow', 'green')
  );
  $result = array();
  array_walk_recursive($arr, function ($value, $key) use (&$result) {
      if (strpos($value, 'a') !== false) {
          $result[] = $value;
      }
  });
  print_r($result); // 输出array('apple', 'banana');

  In the above code, the array_walk_recursive function is used to traverse an array containing a multi-dimensional array. The strpos function in the callback function is used to determine whether a string contains another string.

3. Summary

In PHP, we can use some functions to perform fuzzy queries on arrays. These functions help us find specific patterns in data. In actual development, it is necessary to select the appropriate function to perform fuzzy query according to specific needs.

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