Calling PDO inside a Function [closed] - php

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I am following a project for creating spell checker. However, rather than using regular mysql, i decided to go with PDO. So i converted code to PDO. I am stuck at one point and not sure why i can't call PDO inside any function even after declaring global variable. What i am doing wrong?
Purpose: I have loaded 100k+ words in a table and want to find similar words by searching one word.
<?php
include "db.inc.php";
function spellcheck($word){
global $db;
$output = array();
$word = $db->quote($word);
$words = $db->prepare("SELECT words FROM english WHERE SUBSTRING(word, 0, 1) = '.substr ($word, 1, 2)'");
$words->execute();
while (($words_row = $words->fetch(PDO::FETCH_ASSOC)) !== false){
echo $words_row['word'];
}
}
if (isset($_GET["word"]) && trim($_GET["word"]) !== null){
$word = $_GET["word"];
$spellcheck = spellcheck($word);
}
?>
<form action="" method="GET">
Please type word to check: <input type="text" name="word">
<input type="submit" value="Check">
</form>

Answer 1

Try the following:
function spellcheck($word){
$db = new PDO ("mysql:host=localhost;dbname=splcheck", "root", "");
$db->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION );
$query = "SELECT words FROM english WHERE SUBSTRING(word, 0, 1) = :word";
$stmt = $db->prepare($query);
$stmt->execute(array(':word'=> substr ($word, 1, 2)));
$output = array();
while ($words_row = $stmt->fetch(PDO::FETCH_ASSOC)){
$output[] = $words_row['words'];
}
return $output;
}
Don't use global, pass the connection as argument instead
Make sure you prepare your query properly
Your function was not returning the output
Remove !== false from the while loop its redudant
Avoid typos you forgot s on $words_row['words'];
Using like statement:
$query = "SELECT `words` FROM english WHERE `word` = LIKE :word";
$stmt = $db->prepare($query);
$stmt->execute(array(':word'=>'%'.$word.'%'));