How to query all occurrences of substrings in a string using PHP and JS-PHP Tutorial-php.cn

How to query all occurrences of substrings in a string using PHP and JS

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Release： 2023-04-06 09:34:02

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This article mainly talks about using PHP and js to query all occurrence positions of substrings in strings. It has certain reference value. Friends in need can refer to it.

The indexOf() method in JS can return the position where a specified string value first appears in the string. Using the second parameter, the loop call can get all the positions where the substring appears.

/**
   * 查询字符串中子字符串出现位置
   * @param str
   * @param substr
   * @return {Array}
   */
  function search_substr_pos(str, substr) {
    var _search_pos = str.indexOf(substr), _arr_positions = [];
    while (_search_pos > -1) {
      _arr_positions.push(_search_pos);
      _search_pos = str.indexOf(substr, _search_pos + 1);
    }
    return _arr_positions;
  }

  var str = "look at me,is there anything can prove that I am a good guy ?";
  var $_pos_substr = search_substr_pos(str, &#39;e&#39;);//子串位置
  var $_times_substr = $_pos_substr.length;//出现次数

  console.log($_pos_substr);    //  [ 9, 16, 18, 37 ]
  console.log($_times_substr);  //  4

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Related tutorials: JS video tutorial

##Similarly, use the strpos() method in PHP

/**
 * 查询字符串中子字符串出现位置
 * @param $str
 * @param $substr
 * @return array
 */
function search_substr_pos($str, $substr)
{
  $_search_pos = strpos($str, $substr);
  $_arr_positions = array();
  while ($_search_pos > -1) {
    $_arr_positions[] = $_search_pos;
    $_search_pos = strpos($str, $substr, $_search_pos + 1);
  }
  return $_arr_positions;
}

$str = "look at me,is there anything can prove that I am a good guy ?";
$_pos_substr = search_substr_pos($str, &#39;e&#39;);//子串位置
$_times_substr = count($_pos_substr);//出现次数

print_r($_pos_substr);    //  Array ( [0] => 9 [1] => 16 [2] => 18 [3] => 37 )
print_r($_times_substr);  //  4

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