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Request #63632 $var =. 'val';
Submitted: 2012-11-28 09:57 UTC Modified: 2012-11-28 14:27 UTC
Votes:1
Avg. Score:3.0 ± 0.0
Reproduced:0 of 0 (0.0%)
From: bensor987 at neuf dot fr Assigned:
Status: Wont fix Package: Variables related
PHP Version: Irrelevant OS: All
Private report: No CVE-ID: None
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From: bensor987 at neuf dot fr
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 [2012-11-28 09:57 UTC] bensor987 at neuf dot fr 
Description:
------------
Why not add  "$var =. 'val';" syntax ? 

It would concatenate 'val' before $var.

Actually, you have to do this
<?php
$var = 'val' . $var;
?>

My suggestion make the code shorter :

<?php
$var =. 'val';
?>

Test script:
---------------
<?php
$a = "Hello ";
$b = $a . "World!"; // now $b contains "Hello World!"
$c = "World! " . $a; // now $c contains "World! Hello "

$a = $b = "Hello ";
$a .= "World!";     // now $a contains "Hello World!"
$b =. "World! ";     // now $b contains "World! Hello "
?>

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 [2012-11-28 10:57 UTC] inefedor at gmail dot com 
Collides with:
$asd =.4;
echo $asd;

Output should be: 0.4
 [2012-11-28 11:07 UTC] bensor987 at neuf dot fr 
Erm. Maybe we could use another syntax for this suggestion ?
 [2012-11-28 11:16 UTC] inefedor at gmail dot com 
I think the main concern with "preconcatenation" is 100% chance of reallocation of memory. If it will be part of syntax - people would use it often, but it's something you should avoid using of.

Try to execute this code:
$c = 10000;
$b = 200;

$t1 = microtime(1);

$str1 = "";
for ($i = 0; $i < $c; ++$i) {
    $str1 = str_repeat(mt_rand(0, 9), $b) . "\n" . $str1;
}
$t1 = microtime(1) - $t1;

$t2 = microtime(1);
$strArr = array();
for ($i = 0; $i < $c; ++$i) {
    $strArr[] = str_repeat(mt_rand(0, 9), $b);
}
$strArr = implode("\n", array_reverse($strArr));
$t2 = microtime(1) - $t2;

echo $t1 . "\n" . $t2 . "\n";


First part of this code does exactly the same as second part, but it's 300 times slower.
 [2012-11-28 14:27 UTC] nikic@php.net
-Status: Open +Status: Wont fix
 [2012-11-28 14:27 UTC] nikic@php.net 
This seems to be a rather rare use case (compared to appending) and would probably also start a move to add the other operators in this same version (so we have not only %= but also =% etc). And taken together with the =.4 issue already mentioned, I really don't think that it's worth it.
 
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