php 函数preg_match、preg_match_all ，以及正则表达式规则

<?php
$str = ‘php is the best language phhhhp is‘;
$part = ‘/ph{1,}p/‘;
echo preg_match($part, $str,$ar1);
var_dump($ar1);
echo preg_match_all($part, $str,$ar);
var_dump($ar);
echo $ar[0][0];

1
array
  0 => string ‘php‘ (length=3)
2
array
  0 =>
    array
      0 => string ‘php‘ (length=3)
      1 => string ‘phhhhp‘ (length=6)
php