The PHP chapter Match,match_all of regular expressions

• Preg_match ( $ pattern, $ subject,[array&match]) preg_match_all ( $ Pattern, $ subject,array&matches)
  Preg match matches only once and returns a value of 0 or 1; The
  Preg match all matches multiple times, and how many matches to the number of times the match is returned;
  $ pattern Regular expression;
  $ Subject The string or array to match;

//preg_match,preg_match_all$pattern'/[0-9]/';$subject'y1jp78yn16ww55';//定义两个空数组$m1$m2array();$t1 = preg_match($pattern,$subject,$m1);//$m1输出的是一维数组;把返回值赋给$t1$t2 = preg_match_all($pattern,$subject,$m2);//$m2输出的是二维数组;把返回值赋给$t2show($m1);//使用show函数进行调试输出echo'
   
    ';show($m2);echo'
   
    ';show($t1.'||'.$t2);//匹配到的次数

Preg_match matches a maximum of one time, returning a result that is only 0 or the first match to the element, in the form of an array.
Preg_match_all all matches. The returned result may be 0 or all of the elements that match to the multidimensional array form.

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