php check string for multiple values

Question

I am trying to build a function that I can use to to check a string for multiple values, kind of a generic find needle in haystack kind of function. I have split the values up into an array and tried to loop through the array and check the value against the string with a for each loop but am not experiencing the expected outcome. Please see below the function, some examples and expected outcome.

Function

function find($haystack, $needle) {
    $needle = strtolower($needle);
    $needles = array_map('trim', explode(",", $needle));

    foreach ($needles as $needle) {
        if (strpos($haystack, $needle) !== false) {
            return true;
        }
    }

    return false;
}

Example 1

$type = 'dynamic'; // on a dynamic page, could be static, general, section, home on other pages depending on page and section

if (find($type, 'static, dynamic')) {
    // do something
} else {
    // do something
}

Outcome

This should catch the condition whether the $type contains static or dynamic and run the same code depending on page.

Example 2

$section = 'products labels'; // could contain various strings generated by site depending on page and section

if (find($section, 'products')) {
    // do something
} elseif (find($section, 'news')) {
    // do something
} else {
    // do something
}

Outcome

This should catch the condition specifically if the $section contains 'products' on page within the products section 'news' on a page within the news section.

--

Doesn't seem reliable on returning the desired results and can't figure out why! Any help greatly appreciated!

Your strtolower call ends up not doing anything due to a typo on the next line, but this code should still work as given -- at least for these two particular cases. — Jon
– Jon, Commented Apr 7, 2013 at 20:52
Thanks for pointing that out, I have amended the function above. As you said I believe the function is working correctly, I may have got tangled up and made an error on my part on some of the if / elseif / else statements I was using within my code. — Marc Sanders
– Marc Sanders, Commented Apr 7, 2013 at 22:13

Kevin Lynch · Accepted Answer · 2013-04-07 20:53:46Z

3

Something like this maybe

function strposa($haystack, $needles=array(), $offset=0) {
    $chr = array();
    foreach($needles as $needle) {
            $res = strpos($haystack, $needle, $offset);
            if ($res !== false) $chr[$needle] = $res;
    }
    if(empty($chr)) return false;
    return min($chr);
}

and then

$string = 'Whis string contains word "cheese" and "tea".';
$array  = array('burger', 'melon', 'cheese', 'milk');

if (strposa($string, $array, 1)) {
    echo 'true';
} else {
    echo 'false';
}

This will be true because of cheese

answered Apr 7, 2013 at 20:53

Kevin Lynch

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2 Comments

Marc Sanders Over a year ago

Just so I know, what does the offset option do?

Kevin Lynch Over a year ago

The offset specifies at what point in the string you wish to start searching. In this case we wish to start searching from the beginning.

Baba · Accepted Answer · 2013-04-07 21:05:17Z

1

Why here is a 2way find that can come in handy

var_dump(find('dynamic', 'static, dynamic')); // expect true
var_dump(find('products labels', 'products')); // expect true
var_dump(find('foo', 'food foor oof')); // expect false

Function used

function find($str1, $str2, $tokens = array(" ",",",";"), $sep = "~#") {
    $str1 = array_filter(explode($sep, str_replace($tokens, $sep, strtolower($str1))));
    $str2 = array_filter(explode($sep, str_replace($tokens, $sep, strtolower($str2))));
    return array_intersect($str1, $str2) || array_intersect($str2, $str1);
}

answered Apr 7, 2013 at 21:05

Baba

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Comments

Gerard Wunsch · Accepted Answer · 2014-12-31 17:39:15Z

1

how about:

str_ireplace($needles, '', $haystack) !== $haystack;

answered Dec 31, 2014 at 17:39

Gerard Wunsch

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