Intermediate LevelPHP 8+
How do you capture rendered view templates or intercept output strings using nested ob_start() and ob_get_clean()?
❓ Interview Prompt: Explain Output Buffering functions (ob_start, ob_get_clean, ob_get_contents), capturing template output into variables, and buffer nesting.
Output Buffering intercepts echoed output in server RAM instead of sending it directly to the web server.
Capturing View Templates:
To render a PHP template file into a string variable (for sending HTML emails or passing rendered HTML to JSON responses):
1
Call 'ob_start()' to begin capturing output.
2
Execute 'require' on the PHP view template file.
3
Call 'ob_get_clean()' to capture the buffered HTML as a string and wipe the buffer!
Code Implementation Example
php
<?php
function renderTemplate(string $templatePath, array $data): string {
extract($data); // Extract array keys as local variables ($name, etc.)
ob_start(); // Begin capturing output buffer
require $templatePath;
return ob_get_clean(); // Return rendered HTML string and clean buffer!
}
$html = renderTemplate(__DIR__ . '/views/email.php', ['name' => 'Alice']);💡Rendering PHP view templates into string variables using Output Buffering.
🎯 Interview Key Takeaway
Use ob_start() and ob_get_clean() to capture rendered PHP template output into strings without sending it to the browser.
#Output Buffering#ob_start#Templates#Intermediate
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