trim -- 去除前後多餘空白

語法:string trim (string $str [, string $charlist ])

去除字串開頭和結尾的字元,回傳去除後的字串。如果第二個參數沒給值,預設會去除下列這些字元:

" " (ASCII 32 (0x20)), an ordinary space.

"\t" (ASCII 9 (0x09)), a tab.

"\n" (ASCII 10 (0x0A)), a new line (line feed).

"\r" (ASCII 13 (0x0D)), a carriage return.

"\0" (ASCII 0 (0x00)), the NUL-byte.

"\x0B" (ASCII 11 (0x0B)), a vertical tab.

如果要去除其它字元,可以在第二個參數裡設定。

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