PHP ob_get_level() Function

The ob_get_level() function is an inbuilt function in PHP that is used to get the current output buffer level in a nested level. Output buffering is a feature in PHP that allows you to capture and manipulate output before it is sent to the browser or client.

Syntax

ob_get_level(): int

Parameter

This function does not accept any parameters.

Return Values

The ob_get_level() function returns an integer value that represents the current value of the output buffering.

Program 1: The following program demonstrates the ob_get_level() Function.

PHP

<?php
ob_start();

$bufferingLevel = ob_get_level();

// Output some content
echo "This is content inside the buffer.";

// Start a new output buffer
ob_start();

// Get the new output buffering level
$bufferingLevelNew = ob_get_level();

// Output more content inside the new buffer
echo "This is content inside the new buffer.";

// End the new buffer
ob_end_flush();

// Check the output buffering level
// after ending the new buffer
$bufferingLevelAfterEnd = ob_get_level();

// End the original buffer
ob_end_flush();
?>

Output:

This is content inside the buffer.This is content inside the new buffer. 

Program 2: The following program demonstrates the ob_get_level() Function.

PHP

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

// Function to check output buffering level
// and perform actions accordingly
function checkOutputBufferLevel()
{
    $bufferingLevel = ob_get_level();

    // Display the output buffering level
    echo "Output buffering level: " . $bufferingLevel . "<br>";

    // Perform actions based on the output buffering level
    if ($bufferingLevel === 1) {
        echo "You are in the top-level buffer.<br>";
    } elseif ($bufferingLevel > 1) {
        echo "You are in a nested buffer.<br>";
    } else {
        echo "Output buffering is not active.<br>";
    }
}

checkOutputBufferLevel();

echo "This is content inside the buffer.<br>";

ob_end_flush();
?>

Output:

Output buffering level: 1
You are in the top-level buffer.
This is content inside the buffer.

Reference: https://www.php.net/manual/en/function.ob-get-level.php