Selecting array key in PHP

Question

I've searched Google and the PHP docs but have yet to find a solution for this. E.g. supposing I want to perform a strstr() on all the keys of an array to determine for which keys are closest to what I'm searching for, such that:

for($i=0;$i<count($array);$i++) {
   if(@strstr(key($array[$i]), "$search")) {
     print "Found: ". key($array[$i]). "<br>";
   }
 }

"key($array[$i])" is a placeholder for whatever function or means required for selecting array keys as elements to perform a strstr() upon.

Any help is appreciated sincerely.

Pheonix · Accepted Answer · 2012-03-17 10:01:32Z

2

Use foreach to iterate through Key,Value Pair.

foreach($array as $key=>$value) {
   if(@strstr($key, "$search")) {
     print "Found: ". $key. "<br>";
   }
 }

More reference: http://php.net/manual/en/control-structures.foreach.php

Update to answer comment:

you can use

array_keys — Return all the keys or a subset of the keys of an array

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

edited Mar 17, 2012 at 10:01

answered Mar 17, 2012 at 9:50

Pheonix

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1 Comment

user784446 Over a year ago

Thanks! Of curiosity though, is there a way to accomplish this via a for loop instead?

Basti · Accepted Answer · 2012-03-17 09:50:06Z

1

foreach ($array as $key => $value)
{
    if(strstr($key, $search))
    {
         print "Found: ". $key. "<br>";
    }
}

answered Mar 17, 2012 at 9:50

Basti

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Comments

alex · Accepted Answer · 2012-03-17 09:57:37Z

1

This will do it...

$found = array_filter(
                     array_keys($array), 
                     function($key) use ($search) {
                         return strpos($key, $search) !== FALSE;
                     });

CodePad.

$found will be an array of all keys which included a substring of which is contained in $search.

If you are merely looking for the presence of a string inside of another, use strpos().

edited Mar 17, 2012 at 9:57

answered Mar 17, 2012 at 9:51

alex

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Comments

salathe · Accepted Answer · 2012-03-17 10:05:24Z

0

Another option is to pull out the desired keys in one step, e.g. using preg_grep().

$keys = preg_grep('/'.preg_quote($search, '/').'/', array_keys($array));

foreach ($keys as $key) {
    echo "Found $key<br>";
}

answered Mar 17, 2012 at 10:05

salathe

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