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str_pad (PHP 4 >= 4.0.1, PHP 5) str_pad --
Pad a string to a certain length with another string
Descriptionstring 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.
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.
If the value of pad_length is negative or
less than the length of the input string, no padding takes place.
例子 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_"
?>
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注:
The pad_string may be truncated if the
required number of padding characters can't be evenly divided by
the pad_string's length.
rob at OhReally dot com
04-Mar-2001 07:34
To reformat the date "3-3-2001" to "2001-03-03" you
would use this regexp:
$newdate =
preg_replace("/([0-9]+)-([0-9]+)-([0-9]+)/ie",
"'\\3-'.str_pad('\\2', 2, '0', STR_PAD_LEFT).'-'.str_pad('\\1', 2,
'0', STR_PAD_LEFT)", $date);
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str_ireplace
