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I have an array that doesn't use the 0 index. The array starts from 1,2,3. So I would like to add to the array. I tried do array_push($array, "Choose City"), but this ends up at the end of the array, with array index 4 in this case.

How can I set it to be the array index 0?

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3 Answers 3

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127

http://php.net/manual/en/function.array-unshift.php

array_unshift($array, "Choose City")

or you can do it manually

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6 Comments

@DaveRandom the question is "How can i set it to be the array index 0?" :)
@Oyeme While $array[0] = is a valid answer, it only works once. Using array_unshift() has exactly the same effect on the first call, and works as many times as you want. Sometimes the literal answer is not the best answer...
@DaveRandom it's true,"Question is not exact"
function array_unshift_assoc(&$arr, $key, $val) { $arr = array_reverse($arr, true); $arr[$key] = $val; return = array_reverse($arr, true); }
@RohamRafii "if you need to prepend something to the array without the keys being reindexed and/or need to prepend a key value pair". php.net/manual/en/function.array-unshift.php#106570
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I think you are looking for array_unshift() - this adds an element to the beginning of the array, rather than the end, without overwriting any existing elements.

However, the array will now be indexed starting at 0...

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If you know that Index 0 is not used you can simply assign it:

$array[0] = "Choose City";
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3 Comments

@Matteo The OP said so. This is the simplest answer to add a new element with index 0 to the start of an array (that does not already have one with that index). Other answers make no assumptions about the state of the array and are therefore more robust.
I understand. I'll give you a +1 because actually this is the answer to the specific question. Even if the solution is not general
Omg, this is actually a valid answer and maybe the best! Note: the question is ambiguous. What does it mean "doesn't use the 0 index"? Is it an initial state (can be changed) or an invariant (must be preserved)? In the first case, this is the best answer, in the second case, none of the answers is correct. +1

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