search a php array for partial string match

Question

I have an array and I\'d like to search for the string \'green\'. So in this case it should return the $arr[2]

$arr = array(0 =>         


        

Answer 1

In order to find out if UTF-8 case-insensitive substring is present in array, I found that this method would be much faster than using mb_strtolower or mb_convert_case:

1. Implode the array into a string: $imploded=implode(" ", $myarray);.

2. Convert imploded string to lowercase using custom function: $lowercased_imploded = to_lower_case($imploded);

   function to_lower_case($str) {

$from_array=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z","Ä","Ö","Ü","Õ","Ž","Š"];

$to_array=["a","b","c","d","e","f","g","h","i","j","k","l","m","n","o","p","q","r","s","t","u","v","w","x","y","z","ä","ö","ü","õ","ž","š"];

foreach($from_array as $key=>$val){$str=str_replace($val, $to_array[$key], $str);}

return $str;

}

3. Search for match using ordinary strpos: if(strpos($lowercased_imploded, "substring_to_find")!==false){do something}

Answer 2

<?php
   $a=array("a"=>"red","b"=>"green","c"=>"blue");
   echo array_search("red",$a);
?>

I have same problem so try this...

Answer 3

You can use preg_grep function of php. It's supported in PHP >= 4.0.5.

$array = array(0 => 'blue', 1 => 'red', 2 => 'green string', 3 => 'red');
$m_array = preg_grep('/^green\s.*/', $array);

$m_array contains matched elements of array.

Answer 4

function check($string) 
{
    foreach($arr as $a) {
        if(strpos($a,$string) !== false) {
            return true;
        } 
    }
    return false;
}

Answer 5

function findStr($arr, $str) 
{  
    foreach ($arr as &$s) 
    {
       if(strpos($s, $str) !== false)
           return $s;
    }

    return "";
}

You can change the return value to the corresponding index number with a little modification if you want, but since you said "...return the $arr[2]" I wrote it to return the value instead.

Answer 6

for search with like as sql with '%needle%' you can try with

$input = preg_quote('gree', '~'); // don't forget to quote input string!
$data = array(
    1 => 'orange',
    2 => 'green string',
    3 => 'green', 
    4 => 'red', 
    5 => 'black'
    );
$result = preg_filter('~' . $input . '~', null, $data);

and result is

{
  "2": " string",
  "3": ""
}