Checking if string contain values from an Array in PHP

Question

I'm using PHP 7.1.12 and I trying to check if values from an array are present in a string to do that I'm doing this:

public function checkWords($word) {
    $list = array('extinção','desativação','obrigatório');

    foreach($list as $l) {
        if (stripos($word, $l) !== false) {
            return true;
        } 
    }
    return false;
}

and them I call the function

echo($this->checkWords('Físicaem desativação/extinção voluntária:23000.010237/2012-46''); //returns false

Now comes the weird part, if I go to the function and replace $l with let's say: 'hello'.

public function checkWords($word) {
        $list = array('extinção','desativação','obrigatório');

        foreach($list as $l) {
            if (stripos($word, 'extinção') !== false) {
                return true;
            } 
        }

    }

the function call will return true

echo($this->checkWords('Físicaem desativação/extinção voluntária:23000.010237/2012-46''); //returns true

Any ideas?

Can't replicate your first example returning false: eval.in/928464 — iainn
– iainn, Commented Dec 30, 2017 at 15:12
I think that this may be a charset problem, going to update the question with real data. Anyway here is the function with real data: eval.in/928469 — André Oliveira
– André Oliveira, Commented Dec 30, 2017 at 15:19
Any ideas on how to solve this? I tried to utf8_encode() both of them but it did not work. — André Oliveira
– André Oliveira, Commented Dec 30, 2017 at 15:48

Randall Valenciano · Accepted Answer · 2018-01-02 17:40:06Z

2

Since this question has a bounty, cannot flag it as duplicate, but the issue is with the function used in your case:

stripos($word, 'extinção')

As here is stated, stripos doesn't handle special characters very well and produces this non deterministic results. Use mb_strpos instead.

answered Jan 2, 2018 at 17:40

Randall Valenciano

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Comments

albert · Accepted Answer · 2018-01-03 22:33:05Z

1

This seems to be an issue with the string encoding.

1) Check if using mb_stripos works. http://php.net/manual/en/function.mb-stripos.php

2) if (1) fails you may be serving the file with the wrong encoding. Check if your file charset matches your html charset meta header. https://developer.mozilla.org/en/docs/Web/HTML/Element/meta

<meta charset="utf-8">

answered Jan 3, 2018 at 22:33

albert

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Comments

B. Desai · Accepted Answer · 2018-01-04 09:25:14Z

When you have to deal with multi-byte characters at that time simple string function will not work. You have to use mb functions for it. There is list of mb functions which work with multi-byte characters, Check entire list here:

http://php.net/manual/en/ref.mbstring.php

Now for find position you can use mb_stripos function. Try below code:

function checkWords($word) {
    $list = array('extinção','desativação','obrigatório');
    foreach($list as $l) {
        if (mb_stripos($word, $l) !== false) {
            return true;
        } 
    }
    return false;
}

var_dump(checkWords('Físicaem desativação/extinção voluntária:23000.010237/2012-46')); // return true
echo PHP_EOL;
var_dump(checkWords('Físicaema dessativação/extsinção voluntária:23000.010237/2012-46')); //return false

DEMO

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