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PHP截取字符串几种方式

  • 2026-02-09 00:18:11
PHP截取字符串几种方式

在PHP开发中,字符串截取是常见的操作。不同的场景需要不同的处理方式,选择合适的函数不仅能提升效率,还能避免乱码、性能损耗等问题。以下是几种常用的PHP字符串截取方法及其适用场景的对比分析。

1、substr():适用于英文和固定字节编码

substr() 是PHP内置的字符串截取函数,语法简单,适合处理ASCII字符或单字节编码(如ISO-8859-1)。

语法:
substr(string $string, int $start, ?int $length = null)
示例:
$str = "Hello World";echo substr($str, 0, 5); // 输出:Hello
  • 优点:执行速度快,底层C实现。
  • 缺点:不支持多字节字符(如中文),使用不当会导致乱码。

2、mb_substr():推荐用于中文或多语言环境

针对UTF-8等多字节编码,应使用 mb_substr(),它是 multibyte substring 的缩写,专门处理多字节字符串。

语法:
mb_substr(string $str, int $start, ?int $length = null, ?string $encoding = null)
示例:
$str = "你好世界Hello";echo mb_substr($str, 0, 4, 'UTF-8'); // 输出:你好世
  • 优点:正确处理中文、日文等多字节字符,避免截断乱码。
  • 注意:需确保PHP启用了 mbstring 扩展,否则会报错。

3、使用正则 preg_match() 截取特定模式

当需要按规则提取内容(如提取URL、邮箱、标签内文本),可使用 preg_match() 配合正则表达式。

示例:提取引号内的内容
$str = 'name="张三"';preg_match('/"([^"]+)"/'$str$matches);echo$matches[1]; // 输出:张三
  • 优点:灵活,可按复杂规则提取。
  • 缺点:性能较低,不适合简单截取;正则书写错误易导致问题。

4、explode() + 数组操作:按分隔符拆分截取

如果字符串有明确分隔符(如逗号、斜杠),可用 explode() 拆成数组后取所需部分。

示例:获取文件扩展名
$filename = "example.jpg";$parts = explode('.'$filename);$ext = end($parts); // 输出:jpg
  • 优点:逻辑清晰,适合结构化字符串。
  • 注意:若分隔符不存在,返回原字符串数组;需结合 implode() 或 array_slice() 灵活使用。

5、自定义函数:安全截取并添加省略号

实际开发中常需“截取前N个字符并加...”,可封装一个安全函数:

function truncateString($str$maxLength$encoding = 'UTF-8') {if (mb_strlen($str$encoding) > $maxLength) {return mb_substr($str, 0, $maxLength$encoding) . '...';   }return$str;}echo truncateString("这是一段很长的中文描述", 8); // 输出:这是一段很长...

此方式兼顾可读性与多语言支持,适合前端展示场景。

基本上就这些常用方式。选择哪种取决于你的字符串类型和需求:纯英文用 substr,含中文用 mb_substr,有分隔符考虑 explode,复杂规则上 正则。合理使用,避免乱码和性能浪费。

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  1. CONNECT:[ UseTime:0.001034s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001369s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000786s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000677s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001282s ]
  6. SELECT * FROM `set` [ RunTime:0.001689s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001491s ]
  8. SELECT * FROM `article` WHERE `id` = 459960 LIMIT 1 [ RunTime:0.002030s ]
  9. UPDATE `article` SET `lasttime` = 1770570244 WHERE `id` = 459960 [ RunTime:0.007496s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.002283s ]
  11. SELECT * FROM `article` WHERE `id` < 459960 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001990s ]
  12. SELECT * FROM `article` WHERE `id` > 459960 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008330s ]
  13. SELECT * FROM `article` WHERE `id` < 459960 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.038583s ]
  14. SELECT * FROM `article` WHERE `id` < 459960 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007930s ]
  15. SELECT * FROM `article` WHERE `id` < 459960 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009562s ]
0.265608s