计算X字符的数量

Question

我正在尝试使用explode（）失败的东西，所以我想尝试别的东西。如果我有一个字符串，我如何计算其中的字符数，例如comma中的,

Answer 1

尝试substr_count()：

substr_count($text, ',');

Answer 2

您可以使用count_chars

PHP手册中的示例：

$data = "Two Ts and one F.";
foreach (count_chars($data, 1) as $i => $val) {
   echo "There were $val instance(s) of \"" , chr($i) , "\" in the string.\n";
}

输出（codepad）：

There were 4 instance(s) of " " in the string.
There were 1 instance(s) of "." in the string.
There were 1 instance(s) of "F" in the string.
There were 2 instance(s) of "T" in the string.
There were 1 instance(s) of "a" in the string.
There were 1 instance(s) of "d" in the string.
There were 1 instance(s) of "e" in the string.
There were 2 instance(s) of "n" in the string.
There were 2 instance(s) of "o" in the string.
There were 1 instance(s) of "s" in the string.
There were 1 instance(s) of "w" in the string.