Explanation of the preg_match function [wei static charging]

$ Str = 'sdfasfs12333ddd12233 ';

Preg_match ('/\ d/si', $ str, $ arr); // you can specify three consecutive numbers.

Echo '<pre> ';

Print_r ($ arr );

Echo '</pre> ';

1. This function only matches the first value.

2. $ Arr [0] stores the result.

Preg_match_all all results, so it is a two-dimensional array: $ arr [0] [1] stores the first result, $ arr [0] [n] stores the nth result;

$ Arr [1] [0] stores the results of the first subexpression in the first result. $ arr [1] [n] stores the results of n + 1, the result of the first subexpression;

 

Example: The most commonly used knowledge point during wei's static state

$ Str = "111-555-666 dfs5 + fsfffsd-2215affsfsdf ";

Preg_match ('/(\ d) \ 1 {2}-(\ d) \ 2 {2}-(\ d) \ 3 {2}/si', $ str, $ arr); // you must use 'and cannot use' because reverse capture exists.

Second: http: // localhost/wc. php/15,23,45.html:

Method 1: Use a regular table for processing in php; $ _ SERVER [PATH_INFO];

$ Para = $ _ SERVER ['path _ info'];

$ Pattern = '/(\ d) +/si'; // There is a number
$ Pattern = '// (\ d +), (\ d +), (\ d +) \. html $/si ';
Preg_match ($ pattern, $ para, $ arr );

Method 2: Use apache rewrite for processing.