duanqin9631
duanqin9631
2015-06-03 14:49
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已采纳

ltrim函数不能按预期工作? PHP

I am using ltrim function. I run this code :

echo ltrim("looooooooooooooooooooooooongWord","long");

i expect to get this word : looooooooooooooooooooooooongWord but it prints Word.

what's the problem ?

Edit: I thought it remove the word long, but it appears it remove the l,o,n,g characters !

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2条回答 默认 最新

  • duancongjue9202
    duancongjue9202 2015-06-03 14:50
    已采纳

    ltrim — Strip whitespace (or other characters) from the beginning of a string

    It does exactly as it says, strips chars l, o, n, g.

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  • duannaoben8011
    duannaoben8011 2015-06-03 14:50

    From the docs: (please read them).

    string ltrim ( string $str [, string $character_mask ] )
    

    str

    The input string.

    character_mask

    You can also specify the characters you want to strip, by means of the character_mask parameter. Simply list all characters that you want to be stripped. With .. you can specify a range of characters.

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