PHP count_chars() 函数

2024 年 9 月 4 日 | 阅读 2 分钟

PHP count_chars() 是最重要的字符串函数之一。它用于返回字符串中字符的信息。

语法

参数	描述	必需/可选
string	要检查的字符串	必需
mode	指定返回模式	可选

注意：根据模式，count_chars() 函数将返回以下之一

0：返回一个数组，其中键是字节值，值是每个字节的频率。
1：与 0 相同，但仅列出频率大于零的字节值。
2：与 0 相同，但仅列出频率等于零的字节值。
3：返回一个包含所有唯一字符的字符串。
4：返回一个包含所有未使用字符的字符串。

示例 1

<?php
$str = "Hello World!";
echo "Your given string: ".$str;
echo "<br>"."By using 'count_chars()' function your string is :".count_chars($str,3);
?>

输出

Your given string: Hello World!
By using 'count_chars()' function your string is : !HWdelor

示例 2

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

输出

Array ( [32] => 1 [33] => 1 [72] => 1 [87] => 1 [100] => 1 [101] => 1 [108] => 3 [111] => 2 [114] => 1 )

示例 3

<?php
$str = "PHP is Lovely Language!";
$strArray = count_chars($str,1);

foreach ($strArray as $key=>$value)
   {
   echo "The character <b>'".chr($key)."'</b> was found $value time(s)<br>";
   }
?>

输出

The character ' ' was found 3 time(s)
The character '!' was found 1 time(s)
The character 'H' was found 1 time(s)
The character 'L' was found 2 time(s)
The character 'P' was found 2 time(s)
The character 'a' was found 2 time(s)
The character 'e' was found 2 time(s)
The character 'g' was found 2 time(s)
The character 'i' was found 1 time(s)
The character 'l' was found 1 time(s)
The character 'n' was found 1 time(s)
The character 'o' was found 1 time(s)
The character 's' was found 1 time(s)
The character 'u' was found 1 time(s)
The character 'v' was found 1 time(s)
The character 'y' was found 1 time(s)

下一主题PHP 字符串

PHP count_chars() 函数

语法

注意：根据模式，count_chars() 函数将返回以下之一

示例 1

示例 2

示例 3

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PHP count_chars() 函数

语法

注意：根据模式，count_chars() 函数将返回以下之一

示例 1

示例 2

示例 3

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