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php array interview questions and answers in php

Thursday, 3 July 2014

what is an array?
Ans: An array stores multiple values in one single variable


how to get the first value of an array in php
Ans:current() also works on objects:

<?php

  echo current((object) array('one', 'two')); // Outputs: one

?>

And echo reset($arr);
$firstValue = each($array)[1];

how to get the last value of an array in php


Ans: echo end($array);


3.adding an element in beginning of array
Ans:
$queue = array("orange", "banana");
array_unshift($queue, "apple", "raspberry");

4.Insert "elements" to the end of an array
Ans:

$a=array("red","green");
array_push($a,"blue","yellow");

5. how to delete the last element of an array in php
Ans:
$stack = array("orange", "banana", "apple", "raspberry");
$fruit = array_pop($stack);


6. how to delete the first element of an array in php
Ans:
$stack = array("orange", "banana", "apple", "raspberry");
$fruit = array_shift($stack);

7. how to create an array php5

Ans:  // as of PHP 5.4
$array = [
    "foo" => "bar",
    "bar" => "foo",
];
?>


array_values is Return all the values of an array
array_key_exists is Checks if the given key or index exists in the array
array_search is Searches the array for a given value and returns the corresponding key if successful
 

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