Binnary search

bin.txt

ключ1\tзначение1\x0Aключ2\tзначение2\

index.php

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<?
    
    
    $homepage = file_get_contents('bin.txt');

	$str = mb_convert_encoding($homepage, "UTF-8", "ASCII");
    
    $arrayName = array();
    $arra = explode("\\x0A", $homepage);
    
    foreach ($arra as $key => $value) {

    	$arra2 = explode("\\t", $value);

    	$res = array_merge($arrayName, $arra2);
    	
    	

    	
    }
    
   
    print_r($res);
    	

    
?>