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str_pad (PHP 4 >= 4.0.1) str_pad -- Doplnit řetězec jiným řetězcem na určitou délku Popisstring str_pad ( string input, int pad_length [, string pad_string [, int pad_type]])
str_pad() doplní řetězec input
zleva, zprava nebo z obou stran na danou délku. Pokud jí není předán
volitelný argument pad_string, doplní se
input mezerami, jinak se doplní znaky z
pad_string.
Volitelný argument pad_type může nabýt hodnot
STR_PAD_RIGHT, STR_PAD_LEFT nebo STR_PAD_BOTH. Default je STR_PAD_RIGHT.
Pokud je hodnota pad_length negativní nebo menší než
je délka input, k doplnění nedojde.
Příklad 1. Ukázka str_pad() $input = "Alien";
print str_pad($input, 10); // produces "Alien "
print str_pad($input, 10, "-=", STR_PAD_LEFT); // produces "-=-=-Alien"
print str_pad($input, 10, "_", STR_PAD_BOTH); // produces "__Alien___" |
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User Contributed Notes
str_pad |
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rob@OhReally.com
03-Mar-2001 10:34 |
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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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matthew.somerville@trinity.oxford.ac.uk
05-Aug-2001 01:53 |
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I find:
$mystr = substr("0000$mystr",-4)
(where
the 0s are padding characters and -4 is the negative of the maxlength to
pad to) is even simpler.
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jared@dctkc.com
03-May-2002 11:25 |
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matthew.somerville's code did NOT work for me.
neither did
bert@catsburg.com's.
neither did any other documentation.
(if I
isolated the code by itself, they all worked; but in the context I was
using it, $value was numeric, and there is NO WAY to force it to be a
string in PHP).
I had to roll my own. I used 'trim' to
_force_
the value of $value to be string, because as
long as PHP
thought it was numeric, I could
not use any form of left-padding with
zeros.
This worked (I use sprintf to left-pad
$value with zeros
to a length of 4):
sprintf("%04s",trim($value));
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no_email@php.net
30-May-2002 05:34 |
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To convert your string couldnt you just use strval($var)?
What if
you want non-breaking spaces? If I try to str_pad with
" " PHP thinks my padding string is 6 characters, whn in
HTML it is only one.
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pestilenc@hotmail.com
06-Jun-2002 11:26 |
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For me this worked.
$string = 'help';
#First, str_pad() with
unique character.
$string = str_pad($string, 10, "*",
STR_PAD_BOTH);
#$string = '***help***';
#Second, str_replace with
' '
$string = str_replace("*",
" ", $string);
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cj@NOSPAM.ceejayoz.com
17-Jun-2002 07:38 |
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Another solution to no_email@php.net's problem would be to simply multiply
the padding string by 6.
e.g.
$string = str_pad($string, 10,
" ", STR_PAD_BOTH);
becomes
$string =
str_pad($string, 60, " ", STR_PAD_BOTH);
which
will avoid problems with the above solution, which will mess up text that
has the * in it (or whichever character you're replacing)
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pozytron#mac#com
08-Jul-2002 09:20 |
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The trouble with cj@NOSPAM.ceejayoz.com's version over
pestilenc@hotmail.com's is that many of the times it is used, it will end
up with fragments of the " " code.
For example,
the following code:
<?php
echo
str_pad("TESTSTRING",60," ",STR_PAD_BOTH);
?>
produces
the following HTML
output:
&TESTSTRING &
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saveloywill@netscape.net
10-Aug-2002 07:50 |
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Here is my solution to the above problem.
Simply place the code in
question inbetween html <pre> tags, like
this:
<?php
print "<pre>";
$input =
"Alien";
print str_pad($input, 10);
print
"*";
print "</pre>";
?>
Thanks.
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mreilly@NOSPAM.mac.com
20-Aug-2002 06:23 |
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When provided with a string of characters as the pad value, str_pad uses
all the characters as fill, and can leave partial strings. (eg. If the pad
value is 'ABC' and it needs 5 characters to pad with, it outputs 'ABCAB'.)
This is a problem when you want to pad with non-breaking spaces, the code
for which is 6 characters long.
This can be resolved by first
padding the string with a single character that won't be found in the
strings such as * then doing a str_replace of * with .
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cd579@hotmail.com
22-Aug-2002 08:53 |
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Why not just use a space[' '] instead of a character that COULD be inside
the string, and risk messing it up? Example:
$string =
'test';
$string = str_pad($string, 10, " ",
STR_PAD_BOTH);
// $string now equals ' test'
$string =
str_replace(" ", " ", $string);
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