selecting an array key based on partial string

user_307007 0
Viewed 47336

I have an array and in that array I have an array key that looks like, show_me_160 this array key may change a little, so sometimes the page may load and the array key maybe show_me_120, I want to now is possible to just string match the array key up until the last _ so that I can check what the value is after the last underscore?

strpos substring arrays php string
7 Answers

to search for certain string in array keys you can use array_filter(); see docs

// the array you'll search in
$array = ["search_1"=>"value1","search_2"=>"value2","not_search"=>"value3"];
// filter the array and assign the returned array to variable
$foo = array_filter(
    // the array you wanna search in
    $array, 
    // callback function to search for certain sting
    function ($key){ 
        return(strpos($key,'search_') !== false);
    }, 
    // flag to let the array_filter(); know that you deal with array keys
    ARRAY_FILTER_USE_KEY
);
// print out the returned array
print_r($foo);

if you search in the array values you can use the flag 0 or leave the flag empty

$foo = array_filter(
    // the array you wanna search in
    $array, 
    // callback function to search for certain sting
    function ($value){ 
        return(strpos($value,'value') !== false);
    }, 
    // flag to let the array_filter(); know that you deal with array value
    0
);

or

$foo = array_filter(
    // the array you wanna search in
    $array, 
    // callback function to search for certain sting
    function ($value){ 
        return(strpos($value,'value') !== false);
    }
);

if you search in the array values and array keys you can use the flag ARRAY_FILTER_USE_BOTH

$foo = array_filter(
    // the array you wanna search in
    $array, 
    // callback function to search for certain sting
    function ($value, $key){ 
        return(strpos($key,'search_') !== false or strpos($value,'value') !== false);
    },
    ARRAY_FILTER_USE_BOTH
);

in case you'll search for both you have to pass 2 arguments to the callback function

user_36669470

filter_array($array,function ($var){return(strpos($var,'searched_word')!==FALSE);},);

return array 'searched_key' => 'value assigned to the key'

user_106259730
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