in_array does not work correctly when dealing with strings [duplicate]

Question

This code:

var_dump(in_array("000", array(",00", ".00")));
var_dump(in_array("111", array(",11", ".11")));

output:

bool(true)
bool(false)

Why does the first line return true ?

I've edited your title. Please remember that "does not work" is a vague description of a problem for other people searching for the same problem! — sjagr
– sjagr, Commented Feb 10, 2015 at 17:14

Cfreak · Accepted Answer · 2015-02-10 17:14:52Z

10

It has to do with PHP's type coercion. The "000" essentially gets converted to just 0. To force it to use strict type checking, in_array() accepts a third parameter.

var_dump(in_array("000", array(",00", ".00"), true));

output:

bool(false)

EDIT: @andrekeller also pointed out the ".00" probably gets converted to int 0 as well. Moral of the story, don't trust PHP to get types right.

edited Feb 10, 2015 at 17:14

answered Feb 10, 2015 at 17:09

Cfreak

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4 Comments

davidkonrad Over a year ago

I would have written something similar, +1

André Keller Over a year ago

agreed, deleted my similar answer

Cfreak Over a year ago

@andrekeller was going to upvote you too. You're answer is also correct as it mentions the .00 being converted as well. Knowing PHP its probably both

André Keller Over a year ago

@Cfreak: well then update your answer, does not make sense have to almost identical answers

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