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                # PHP chop() 函數 ## 定義和用法 chop() 函數從字符串的末端開始刪除空白字符或其他預定義字符。 該函數的 [rtrim()](/php/func_string_rtrim.asp "PHP rtrim() 函數") 函數的別名。 ### 語法 ``` chop(string,charlist) ``` | 參數 | 描述 | | --- | --- | | string | 必需。規定要轉換的字符串。 | | charlist | 可選。規定從字符串中刪除哪些字符。如果未設置該參數,則全部刪除以下字符: "`\0`" - ASCII 0, NULL "`\t`" - ASCII 9, 制表符 "`\n`" - ASCII 10, 新行 "`\x0B`" - ASCII 11, 垂直制表符 "`\r`" - ASCII 13, 回車 "` `" - ASCII 32, 空格 | ## 例子 在本例中,我們將使用 chop() 函數從字符串右端刪除字符: ``` <?php $str = "Hello World!\n\n"; echo $str; echo chop($str); ?> ``` 以上代碼輸出的源代碼: ``` <html> <body> Hello World! Hello World!</body> </html> ``` 輸出: ``` Hello World! Hello World! ```
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