Single quoted vs double quoted string

Single quoted vs double quoted string - PHP

Tagged in : PHP

Use single quoted strings unless you need to interpolate variables into your string. This saves PHP the time to scan the string for contained variables and saves about 50% execution time.

<?php
function getmicrotime($t) {

list($usec, $sec) = explode(" ",$t);

return ((float)$usec + (float)$sec);

}
$start = microtime();

$a = array();

for($i=0;$i<100;$i++) {

array_push($a, "Aaron rules!");

}
$end = microtime();

$t1 = (getmicrotime($end) - getmicrotime($start));

echo "

double quotes: $t1
"; 

unset($a); 

$start = microtime(); 



$b = array(); 



for($i=0;$i<100;$i++) { 



     array_push($b, 'Aaron rules!'); 



} 

$end = microtime(); 



$t2 = (getmicrotime($end) - getmicrotime($start)); 



$t3 = $t1-$t2; 



echo "single quotes: $t2
difference...: $t3