如何防止PHP随机模板被重复引入？

Hey there! The problem with your current code is that each page refresh is a fresh request—there's no way to remember which templates were already included. To fix this, we can use PHP sessions to persist the list of used templates across refreshes. Here's a step-by-step implementation:

<?php
// Start or resume a session to store data between page loads
session_start();

// Define your full list of templates
$templates = array("template1.php", "template2.php", "template3.php");

// Initialize the used templates array in the session if it doesn't exist
if (!isset($_SESSION['used_templates'])) {
    $_SESSION['used_templates'] = array();
}

// Create a list of templates that haven't been used yet
$available_templates = array_diff($templates, $_SESSION['used_templates']);

// If all templates have been used, reset the list to start over
if (empty($available_templates)) {
    $_SESSION['used_templates'] = array();
    $available_templates = $templates;
}

// Pick a random template from the available options
$random_template = $available_templates[array_rand($available_templates, 1)];

// Add the selected template to the used list in the session
$_SESSION['used_templates'][] = $random_template;

// Include the chosen template
include $random_template;
?>

How this works: #

• session_start(): This kicks off a user-specific session, letting us store data (like used templates) that persists across page refreshes.
• Tracking used templates: The $_SESSION['used_templates'] array keeps a record of every template that's been included.
• Filtering available templates: array_diff() compares the full template list with the used list to get only the templates that haven't been loaded yet.
• Resetting when exhausted: If all templates are used, we clear the used list so the cycle starts fresh.
• Random selection: We pick a random entry from the available templates, add it to the used list, then include it.

This ensures you'll never get the same template twice in a row until all options have been exhausted, at which point it starts over.

内容的提问来源于stack exchange，提问作者user9402741