正则表达式，保存数组中的值

Question

In a string each time there is a word with a # I want to save the word in an array, here my code :

<?php
function tag($matches)
{
    $hash_tag = array();
    $hash_tag[]=$matches[1];
    return '<strong>' . $matches[1] . '</strong>';
}
$test = 'this is a #test1 #test2 #test3 #test4 #test5 #test6';
$regex = "#(\#.+)#";
$test = preg_replace_callback($regex, "tag", $test);
echo $test;
?>

But I don't know how to put each new word in a new cell of the array $hash_tag and i really need help on this one

Answer 1

I can see you want to do 2 things at the same time

• Replace the words with strong tag
• Get all the words ans use later

You can try

$hash_tag = array();
$tag = function ($matches) use(&$hash_tag) {
    $hash_tag[] = $matches[1];
    return '<strong>' . $matches[1] . '</strong>';
};

$test = 'this is a #test1 #test2 #test3 #test4 #test5 #test6';
$regex = "/(\#[0-9a-z]+)/i";
$test = preg_replace_callback($regex, $tag, $test);
echo $test;
var_dump($hash_tag); <------ all words now in this array 

Output

this is a #test1 #test2 #test3 #test4 #test5 #test6

array (size=6)
  0 => string '#test1' (length=6)
  1 => string '#test2' (length=6)
  2 => string '#test3' (length=6)
  3 => string '#test4' (length=6)
  4 => string '#test5' (length=6)
  5 => string '#test6' (length=6)