PHP: str_repeat

Описание

string str_repeat ( string input, int multiplier )

Возвращает строку input_str, повторенную multiplier раз. multiplier должен быть больше или равен нулю. Если он равен нулю, возвращается пустая строка.

Пример 1. Пример использования str_repeat()


<?php

echo str_repeat("-=", 10);

?>

Выводит "-=-=-=-=-=-=-=-=-=-=".

См. также for, str_pad() и substr_count().

str_repeat

15-Sep-2005 07:32


In reply to what Roland Knall wrote:



It is much simpler to use printf() or sprintf() for leading zeros.



<?php

   printf("%05d<br>\n",  1); // Will echo 00001

   sprintf("%05d<br>\n",  1); // Will return 00001

?>

21-Jul-2003 10:45


str_repeat does not repeat symbol with code 0 on some (maybe all?) systems (tested on PHP Version 4.3.2 , FreeBSD 4.8-STABLE i386 ).



Use <pre>

while(strlen($str) < $desired) $str .= chr(0);

</pre> to have string filled with zero-symbols.

abodeman at enoughspamalready dot yahoo dot com
27-May-2003 02:35


Recursive functions are almost always slower than the corresponding iterative function. Therefore, dmarsh's function will be faster than Gail's.

Gal Chen
18-Mar-2003 07:18


a response to dmarsh

if u do wanna write a function that fills a string to a length its best to use a recoursive function



function str_repeattolength ($str, $length) {

  $strlength= strlen($str);

  if ($strlength>= $length) {

    return substr($str,0,$length);

  } else {

    return $str . str_repeattolength($str, $length - $strlength);

  }

}



or just use str_pad

bob at bobarmadillo dot com
20-Nov-2002 04:26


While dmarsh's function is nice it duplicates the function str_pad().

str_repeat is good when you want the entire string repeated.

For instance, if you want to put 6 &nbsp;'s in somewhere, str_pad will cut it off at odd places whereas str_repeat will return 6 full &nbsp's.



the following will return the same result as dmarsh's code.



$t = "-=-";

print str_pad('',0,$t)."\n";

print str_pad('',1,$t)."\n";

print str_pad('',2,$t)."\n";

...etc.

dmarsh dot NO dot SPAM dot PLEASE at spscc dot ctc dot edu
17-Sep-2002 04:15


If you need an alternate str_repeat function that outputs an exact length using a particular input string to fill that length (as opposed to repeating the input string), try this little gem:





<?php









// use this function:




function str_repeat2($input, $length) {




// returns the output exactly $length using $input to fill that length




$answer="";









if ($length>=1 && strlen($input)>=1) {




$answer = substr(str_repeat($input,  ceil($length/strlen($input)) ), 0, $length);




}









return $answer;




}









//demo the function's use:




$t="-=-";




print str_repeat2($t,0)."\n";




print str_repeat2($t,1)."\n";




print str_repeat2($t,2)."\n";




print str_repeat2($t,3)."\n";




print str_repeat2($t,4)."\n";




print str_repeat2($t,5)."\n";




print str_repeat2($t,6)."\n";




?>

dakota at dir dot bg
25-Jun-2002 03:06


Note that the first argument is parsed only once, so it's impossible to do things like this:



echo str_repeat(++$i, 10);



The example will produce 10 times the value of $i+1, and will not do a cycle from $i to $i+10.

bryantSPAMw at geocities dot SPAM dot com
25-Oct-2001 04:16


(For the benefit of those searching the website:)





This is the equivalent of Perl's "x" (repetition) operator, for eg.  str_repeat("blah", 8) in PHP does the same thing as "blah" x 8 in Perl.