html - explode the strings from the file in php -

as new php.i trying explode strings file.i want part of strings display in html fields. here complete code:-

<?php    if(isset($_post["submit"]))  {  	$lhs= array();     	$rhs= array();      foreach($_post $key => $value){       	if($key == "submit") continue;       	echo $key ."=". $value ;      	echo "<br>";      	$lhs[]=$key; //first array left hand side       	$rhs[]=$value; //second array right hand side      	}  	  	file_put_contents("file2.txt", implode(php_eol, array_map(function($v1, $v2)    	{  	  return "$v1=$v2";    	},$lhs, $rhs)));  }  $file_contents=file_get_contents("file2.txt");  $data=explode("=" ,$file_contents);  print_r($data);  ?>    	<form name="form1" method="post" action="">  	name: <input type="text" name="name" value="<?php echo "$data[0]";?>"><br>      phone no: <input type="text" name="phone" /><br/>      course:<input type="text" name="course" /> <br />      <input type="submit" name="submit" value="sign up">      </form>       

and output this

name=xyz phone=12334 course=bba array ( [0] => name [1] => xyz phone [2] => 12334 course [3] => bba ) 

now want display values

 xyz  12334  bba 

in respective html fields.and if edit values in file update in html fields when refresh/reload page. , not sure approach correct or not achieve requirement.

please or advice appreciated.thanks in advance.

$str=implode(",",$data);  $str1=str_replace(" ",",",$str); $output_array=explode(",",$str1); print_r($output_array); 

this give array

array (     [0] => name     [1] => xyz     [2] => phone     [3] => 12334     [4] => course     [5] => bba ) 

now can use array

further can make assocaitive array

$arr_values=array(); for($i=0;$i<sizeof($output_array);$i++) { $arr_values[$output_array[$i]] = $output_array[++$i]; } print_r($arr_values);  

this give out put

array (     [name] => xyz     [phone] => 12334     [course] => bba )