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• PHP Introduction
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• PHP Interview Question
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• Top 6 PHP frameworks
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• PHP $ and $$
• Difference between include() and require()
• PHP isset() function
• Types of Errors in PHP
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• PHP is_null() function
• PHP isset vs empty vs is_null
• PHP empty ( ) Function
• How to get current page URL in PHP
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• PHP Contact Form

• stristr() function
• strstr() function
• strrev() function
• substr() function
• ucfirst() function
• ucwords() function
• array_keys() function
• array_map() function
• array_merge() function
• array_combine() function
• array_push() function
• array_pop() function
• array_search() function
• array_sum() function
• in_array() function
• count() function
• sizeof() function
• isset() function
• unset() function
• unlink() function
• serialize() function
• unserialize() function

<?php
$var_string = "hello, world!";
$result = ucfirst($var_string);
echo $result; 
?>