Regular expressions in PHP match, match_all

• preg_match($pattern,$subject,[array&match]) preg_match_all($pattern,$subject,array&matches)
  preg match only matches once and returns a value of 0 or 1;
  preg match all matches multiple times, how many times it matches and returns the number of matches;
  $pattern regular expression;
  $subject the string or array to be matched;

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

preg_match matches at most once , the return result is only 0 or the first matched element, in array form.
preg_match_all matches all. The return result may be 0 or all matched elements, in the form of a multi-dimensional array.

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