preg_match_all沒有做我期待它做的事情？

Question

此代碼似乎很容易和邏輯給我，我一定是因爲它沒有做什麼，我希望它是累了..

//look for any letter, number or underscore  
$regexTags = "/[a-z0-9_]/i"; 

//needlessly large string.. 
$string = "111 222 333 444 555 666 777"; 
preg_match_all($regexTags, $string, $regexMatches); 
print_r($regexMatches); 

//$regexMatches spits out [0] => Array ([0] => 1 [1] => 1 [2] => 1 [3] => 2 [4] => 2 [5] => 2 [6] => 3 [7] => 3 [8] => 3 [9] => 4 [10] => 4 [11] => 4 [12] => 5 [13] => 5 [14] => 5 [15] => 6 [16] => 6 [17] => 6 [18] => 7 [19] => 7 [20] => 7)) 
//as expected. 

//Count how many variables are in the array 
$matchCount = count($regexMatches); 

if ($matchCount < 5){ 
    echo "less than 5"; 
} 

爲什麼「不到5」仍在即使印刷雖然有相當清楚的20 $ regexMatches數組中的值？我究竟做錯了什麼？

Answer 1

嘗試count($regexMatches[0])。

:)

Answer 2

爲什麼不能你只需要使用preg_match_all返回值：

$matchCount = preg_match_all($regexTags, $string, $regexMatches); 
echo $matchCount;