Prevent SQL injection in PHP?

Use prepared statements and parameterized queries for sql injection attacks.SQL statements that are sent to and parsed by the database server separately from any parameters. This way it is impossible for an attacker to inject malicious SQL.
You basically have two options to achieve this:
Using PDO:

$stmt = $dbConnection->prepare('SELECT * FROM employees WHERE name = ?');
$stmt->bind_param('s', $name);

$stmt->execute();

$result = $stmt->get_result();
while ($row = $result->fetch_assoc()) {
// do something with $row
}

http://www.phptrick.in/php-arrays/ 

minify js to increase speed, on line tools available to minify 

<?php
$count_posts = wp_count_posts();

$published_posts = $count_posts->publish;
?>

code for moveavle header in website

.head{
position: fixed;
float: left;
width: 100%;
z-index: 9999;
background:rgba(0,0,0, 0.5);
}

sample php tasks yii details

https://ephptutorial.wordpress.com/beginners-skillsets-to-be-achieved-to-become-php-programmer/  --- yii tutorial

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Remove headers already sent error

for this open wp-config file. remove any space before <?php or after ?>

then open page in notepad++ select encoding ansi first option save. uplaod errors will be removed