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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