PHP combines the regular get string in the digital _php technique

PHP combines regular get number in string

<?php
  $patterns = "/\d+/";//First type
  //$patterns = "/\d/";  The second kind of
  $strs = "left:0px;top:202px;width:90px;height:30px";
  Preg_match_all ($patterns, $strs, $arr);
  Print_r ($arr);
   
/*************** Run result *********************/ 
//First
array
(
  [0] => array
    (
      [0] => 0
      [1] =>
      [2] =>
      [3] =>)
)
//second
array
(
  [0] => array
    (
      [0] => 0
      [1] => 2
      [2] => 0
      [3] => 2
      [4] => 9
      [5] => 0
      [6] => 3
      [7] => 0
    )
)

PHP gets the number of the specified string $a = "123 of times 12345678 occur"; Give a function to crawl to the number 12345678 in $a, if not, then return 0
To write a good function,
1. Match only digits of length 8
2. If found, return to change the number, if not then return 0

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

Search on the Internet to this test can also be found, but if the character length is not d{4} indefinite length is not

function FindNum ($str = ') {
 if (empty ($STR)) {return ';}
 $reg = '/(\d{4} (\.\d+)?) /is ';//matching number of regular expression
 Preg_match_all ($reg, $str, $result);
 if (Is_array ($result) &&!empty ($result) &&!empty ($result [1]) &&!empty ($result [1][0])) { return
 $result [1][0];
 }
 return ';
}

And then I found out that there was a

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

Found that this can get any number of consecutive lengths, of course, also see a lot of online, but there is a can, so there is no more testing.

The above mentioned is the entire content of this article, I hope you can enjoy.