Several ways to obtain numbers in strings using PHP with regular expressions

This article mainly introduces several methods of obtaining numbers in strings using PHP combined with regular expressions. Interested friends can refer to it. I hope it will be helpful to everyone.

php combines regular expressions to get the numbers in the string

<?php
  $patterns = "/\d+/"; //第一种
  //$patterns = "/\d/";  //第二种
  $strs="left:0px;top:202px;width:90px;height:30px";
  preg_match_all($patterns,$strs,$arr);
  print_r($arr);
   
/***************运行结果*********************/ 
//第一种
Array
(
  [0] => Array
    (
      [0] => 0
      [1] => 202
      [2] => 90
      [3] => 30
    )
)
//第二种
Array
(
  [0] => Array
    (
      [0] => 0
      [1] => 2
      [2] => 0
      [3] => 2
      [4] => 9
      [5] => 0
      [6] => 3
      [7] => 0
    )
)

php gets the number in the specified string $a="123 happened in the era and 12345678 happened"; Give a function to grab $ The number 12345678 in a, if not, returns 0
Write the function well,
1. Only match numbers with length 8
2. If found, return the changed number, if not, return 0

function a($str){
return preg_match('/([0-9]{8})/',$str,$a) ? $a[1] : 0;
}

I searched for this on the Internet and tested it and found that it is OK, but if the character length is not d{4} or a fixed length, it will not work.

function findNum($str=''){
 if(empty($str)){return '';}
 $reg='/(＼d{4}(＼.＼d+)?)/is';//匹配数字的正则表达式
 preg_match_all($reg,$str,$result);
 if(is_array($result)&&!empty($result)&&!empty($result[1])&&!empty($result[1][0])){
 return $result[1][0];
 }
 return '';
}

Later I found out that there is one

$str=trim($str);
 if (preg_match('|(＼d+)|',$str,$r)) return $r[1];

I found that this can get numbers of any continuous length. Of course, I saw a lot of them on the Internet, but there was one that worked, so I didn’t test it again.

Summary: The above is the entire content of this article, I hope it will be helpful to everyone's study.

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