JNTU MCA 2022 WEB TECHNOLOGIES Previous Question Paper (March/April - 2022 - R20)

PHP provides various control structures to manage the flow of execution in a script, categorized into conditional statements and loops:

• Conditional Statements: These allow code to execute based on specific conditions. The if statement executes code if a condition is true; if-else provides an alternative path; elseif handles multiple conditions; and switch selects one of many blocks of code to execute based on a variable's value.
• Looping Structures: These repeat blocks of code. The while loop repeats as long as a condition is true. The do-while loop ensures the code block executes at least once before checking the condition. The for loop is used when the number of iterations is known. The foreach loop is specifically designed for iterating over arrays and objects.
• Control Flow Modifiers: The break statement terminates a loop or switch, while continue skips the remainder of the current loop iteration and proceeds to the next one.

To search for a keyword within the content of a URL, you can use file_get_contents() to fetch the page source and strpos() to check for the existence of the keyword.

<?php
$url = "https://www.example.com";
$keyword = "search_term";

$content = @file_get_contents($url);

if ($content !== false) {
    if (strpos($content, $keyword) !== false) {
        echo "Keyword found on the page.";
    } else {
        echo "Keyword not found.";
    }
} else {
    echo "Failed to retrieve URL content.";
}
?>