How to skip the 1st key in an array loop?

Question

I have the following code:

if ($_POST[\'submit\'] == \"Next\") {
    foreach($_POST[\'info\'] as $key => $value) {
        echo $value;
    }
}


        

Answer 1

foreach($_POST['info'] as $key=>$value) {
    if ($key == 0) { //or what ever the first key you're using is
        continue;
    }  else { 
        echo $value;
    }
}

Answer 2

On a array filled with 1000 elements the difference is quite minimal.

Test:

<?php
function slice($a)
{
    foreach(array_slice($a, 1) as $key)
    {

    }

    return true;
}

function skip($a)
{
    $first = false;

    foreach($a as $key)
    {
        if($first)
        {
            $first = false;
            continue;
        }
    }

    return true;
}

$array = array_fill(0, 1000, 'test');

$t1 = time() + microtime(true);

for ($i = 0; $i < 1000; $i++)
{
    slice($array);
}

var_dump((time() + microtime(true)) - $t1);

echo '<hr />';

$t2 = time() + microtime(true);

for ($i = 0; $i < 1000; $i++)
{
    skip($array);
}

var_dump((time() + microtime(true)) - $t2);
?>

Output:

float(0.23605012893677)

float(0.24102783203125)

Answer 3

How about something like this? Read off the first key and value using key() and current(), then array_shift() to dequeue the front element from the array (EDIT: Don't use array_shift(), it renumbers any numerical indices in the array, which you don't always want!).

    <?php

    $arr = array(

      'one' => "ONE!!",
      'two' => "TWO!!",
      'three' => "TREE",
      4 => "Fourth element",
      99 => "We skipped a few here.."

    ) ;

    $firstKey = key( $arr ) ;
    $firstVal = current( $arr ) ;

    echo( "
OK, first values are $firstKey, $firstVal
" ) ;
    ####array_shift( $arr ) ; #'dequeue' front element # BAD! renumbers!
    unset( $arr[ $firstKey ] ) ;  # BETTER!

    echo( "
Now for the rest of them
" ) ;
    foreach( $arr as $key=>$val )
    {
      echo( "
$key => $val
" ) ;
    }

    ?>

Answer 4

in loop:

if ($key == 0) //or whatever
   continue;

Answer 5

Couldn't you just unset the array...

So if I had an array where I didn't want the first instance, I could just:

unset($array[0]);

and that would remove the instance from the array.

Answer 6

foreach(array_slice($_POST['info'], 1) as $key=>$value) {
    echo $value;
}

Alternatively if you don't want to copy the array you could just do:

$isFirst = true;
foreach($_POST['info'] as $key=>$value) {
    if ($isFirst) {
        $isFirst = false;
        continue;
    }   
    echo $value;
}