CODEWITHSUNDEEP
phparraysloopsforeach
Md. Sahadat Hossain
Md. Sahadat Hossain

Reputation: 3236

Is there any way to loop an array from a specific key in php

Let I have an array like this

Array
(
    [126] => pitch
    [134] => pithc2
    [155] => pithc3
    [87]  => pithc4
    [45]  => pithc5
    [192] => pithc6
)

Now is there any way to apply loop in this array from specific key? Example: I want to output after 155 then output look like 

1. pitch4,
2. pithc5
3. pithc6

if I want get output after 45 then output look like 

1. pithc6

Upvotes: 0

Views: 588

Answers (1)

Rizier123
Rizier123

Reputation: 59681

This should work for you:

Here I use reset(), next(), current(), key(), end() to loop through the array as you want it

<?php

    $arr = array(126 => "pitch", 134 => "pithc2", 155 => "pithc3", 87  => "pithc4", 45  => "pithc5", 192 => "pithc6");
    $from = 134;

    //Get last element + rest the array
    $end = end($arr);
    reset($arr);

    //set array pointer to '$from'
    while(key($arr) != $from) next($arr);


    while(current($arr) != $end) {

        next($arr);
        //prints the current array element and goes to the next one
        echo current($arr) . "<br />";

    }

?>

Output:

pithc3
pithc4
pithc5
pithc6

And if you want to limit how many elements should be printed you can use this:

<?php

    $arr = array(126 => "pitch", 134 => "pithc2", 155 => "pithc3", 87  => "pithc4", 45  => "pithc5", 192 => "pithc6");
    $from = 134;
    $howmany = 6;

    //Get last element + rest the array
    $end = end($arr);
    reset($arr);

    //set array pointer to '$from'
    while(key($arr) != $from) next($arr);

    //go through '$howmany' times
    for($i = 0; $i < $howmany; $i++) {

        //prints the current array element and goes to the next one
        echo current($arr) . "<br />";

        //rest the array to the beginning, while it reached the end
        if(current($arr) == $end)
            reset($arr);
        else
            next($arr);

    }

?>

Output:

pithc2
pithc3
pithc4
pithc5
pitch6
pithc

Upvotes: 3

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