How can output buffering be used to render content before a function call in PHP?

When we want to render content before a function call in PHP, we can use output buffering to capture the output and then manipulate it as needed before finally displaying it. By turning on output buffering before the function call, we can store the output in a buffer and then manipulate it before sending it to the browser. 

<?php
ob_start(); // Start output buffering

// Render content before function call
echo "Content before function call.";

// Function call
function_to_call();

// Get the buffered content
$content = ob_get_clean();

// Manipulate the content as needed
$content = strtoupper($content);

// Display the final content
echo $content;

// Function definition
function function_to_call() {
    echo "Function called.";
}
?>

Keywords

output buffering render content function call PHP buffer output

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