Defining php5.5 by rasmus lerdorf

PHP5.5

perforance Inmprovement:

• nested calls
• call stack pre-allocated by compiler
• bundled opcode cache

Generators:

<?php
function xrange($start,$end) {
    for ($i=$start;$i <= $send;$i++) {
        yield $i;
   
}
foreach (xrange(0,5) as $i) {
     echo $i,"\n";
}

finally:

<?php
$db=mysqli_connect();
try{
call_some_function($db);
}finally{
mysqli_close($db);
}
list() in foreach
$names =[["john","smith"],["fred","johnson"]];
foreach($names as list($first,$last)){
echo $first,$last;
}

Const array/string Dereferncing:

echo array(1,2,3)[0];//output 1
echo "foobar"[3];//output b
echo[1,3,4][2];//output 4

• empty() support for functions/expressions
• curl upload functionality rewritten
• simplified password hashing API