PHP5中文手册·Pad a string to a certain length with another string -- 追寻梦想＞编程乐园＞PHP 编程

说明

string str_pad ( string $input , int $pad_length [, string $pad_string [, int $pad_type ]] )

This functions returns the input string padded on the left, the right, or both sides to the specified padding length. If the optional argument pad_string is not supplied, the input is padded with spaces, otherwise it is padded with characters from pad_string up to the limit.

参数

input: The input string.
pad_length: If the value of pad_length is negative or less than the length of the input string, no padding takes place.
pad_string: Note: The pad_string may be truncated if the required number of padding characters can't be evenly divided by the pad_string 's length.
pad_type: Optional argument pad_type can be STR_PAD_RIGHT, STR_PAD_LEFT, or STR_PAD_BOTH. If pad_type is not specified it is assumed to be STR_PAD_RIGHT.

返回值

Returns the padded string.

范例

Example#1 str_pad() example


<?php
$input = "Alien";
echo str_pad($input, 10);                      // produces "Alien     "
echo str_pad($input, 10, "-=", STR_PAD_LEFT);  // produces "-=-=-Alien"
echo str_pad($input, 10, "_", STR_PAD_BOTH);   // produces "__Alien___"
echo str_pad($input, 6 , "___");               // produces "Alien_"
?>


	PHP5中文手册 str_ireplace str_repeat Strings PHP Manual str_pad (PHP 4 >= 4.0.1, PHP 5) str_pad — Pad a string to a certain length with another string 说明 string str_pad ( string `$input` , int `$pad_length` [, string `$pad_string` [, int `$pad_type` ]] ) This functions returns the `input` string padded on the left, the right, or both sides to the specified padding length. If the optional argument `pad_string` is not supplied, the `input` is padded with spaces, otherwise it is padded with characters from `pad_string` up to the limit. 参数 `input` The input string. `pad_length` If the value of `pad_length` is negative or less than the length of the input string, no padding takes place. `pad_string` Note: The `pad_string` may be truncated if the required number of padding characters can't be evenly divided by the `pad_string` 's length. `pad_type` Optional argument `pad_type` can be `STR_PAD_RIGHT`, `STR_PAD_LEFT`, or `STR_PAD_BOTH`. If `pad_type` is not specified it is assumed to be `STR_PAD_RIGHT`. 返回值 Returns the padded string. 范例 Example#1 str_pad() example `<?php $input = "Alien"; echo str_pad($input, 10); // produces "Alien " echo str_pad($input, 10, "-=", STR_PAD_LEFT); // produces "-=-=-Alien" echo str_pad($input, 10, "_", STR_PAD_BOTH); // produces "__Alien___" echo str_pad($input, 6 , "___"); // produces "Alien_" ?>` str_ireplace str_repeat Strings PHP Manual