How to Echo the Whole Content of a .HTML File in PHP

How can I echo the whole content of a .html file in PHP?

You should use readfile():

readfile("/path/to/file");

This will read the file and send it to the browser in one command. This is essentially the same as:

echo file_get_contents("/path/to/file");

except that file_get_contents() may cause the script to crash for large files, while readfile() won't.

Include whole content of a file and echo it

Just do:

include("http://www.mysite.com/script.php");

Or:

echo file_get_contents("http://www.mysite.com/script.php");

Notes:

This may slow down your page due to network latency or if the other server is slow.
This requires allow_url_fopen to be on for your PHP installation. Some hosts turn it off.
This will not give you the PHP code, it'll give you the HTML/text output.

How would you echo the content of a file in php?

Try something like:

<?php

$whitelistedKeys = array(
    'Key', 'key1'
);
 
$input = $_GET['key'];
if (in_array($input, $whitelistedKeys, TRUE)) {
    echo 'Whitelisted<br>';

    $filePath = __DIR__ . '/my-file.txt';
    echo "Content of \"$filePath\" file is:<br>"; 
    echo file_get_contents($filePath);
} else {
    echo 'Not Whitelisted';
}
?>

Note that I am not using double-quote to improve performance.
And am using __DIR__ to load my-file.txt from same directory which the PHP-script is in.

PHP echo HTML file

What do you get if you do:

var_export(get_magic_quotes_gpc());

Is it on? (true)

If so:

http://www.php.net/manual/en/security.magicquotes.disabling.php

$response = stripslashes(file_get_contents("second.html"));

How can I echo HTML in PHP?

There are a few ways to echo HTML in PHP.

1. In between PHP tags

<?php if(condition){ ?>
     <!-- HTML here -->
<?php } ?>

2. In an echo

if(condition){
     echo "HTML here";
}

With echos, if you wish to use double quotes in your HTML you must use single quote echos like so:

echo '<input type="text">';

Or you can escape them like so:

echo "<input type=\"text\">";

3. Heredocs

4. Nowdocs (as of PHP 5.3.0)

Template engines are used for using PHP in documents that contain mostly HTML. In fact, PHP's original purpose was to be a templating language. That's why with PHP you can use things like short tags to echo variables (e.g. <?=$someVariable?>).

There are other template engines (such as Smarty, Twig, etc.) that make the syntax even more concise (e.g. {{someVariable}}).

The primary benefit of using a template engine is keeping the design (presentation logic) separate from the coding (business logic). It also makes the code cleaner and easier to maintain in the long run.

If you have any more questions feel free to leave a comment.

Further reading is available on these things in the PHP documentation.

NOTE: PHP short tags <? and ?> are discouraged because they are only available if enabled with short_open_tag php.ini configuration file directive, or if PHP was configured with the --enable-short-tags option. They are available, regardless of settings from 5.4 onwards.

How to echo pieces of html from an external file on same folder?

Use includes

<html>
    <head>
    </head>
    <body>
        <?php
            include 'header.html';
            include 'container.html';
            include 'footer.html';
        ?>
    </body>
</html>

http://php.net/manual/en/function.include.php

PHP file content echo replace by text and positioning it somewhere in HTML page

Add an echo statement that displays an image that depends on the state of the LED.

You can also simplify the code by noticing all the repetition and using a variable

$fileName = __DIR__.'/txt/led2.txt';

if (file_exists($fileName)) {
    $current_state = file_get_contents($fileName);
    if ($current_state != "0" && $current_state != "1") {
        file_put_contents($fileName, '1');
        $current_state = 1;
    }
} else {
    $current_state = 1;
    file_put_contents($fileName, $current_state);
}

if (isset($_GET['on4'])) {
    shell_exec("/usr/local/bin/gpio -g write 15 $current_state");
    $current_state = 1 - $current_state;
    file_put_contents($fileName, $current_state);
}

echo $current_state == 1 ? '<img src="images/ledOff.png">' :  '<img src="images/ledOn.png">';

How do I get the HTML code of a web page in PHP?

If your PHP server allows url fopen wrappers then the simplest way is:

$html = file_get_contents('https://stackoverflow.com/questions/ask');

If you need more control then you should look at the cURL functions:

$c = curl_init('https://stackoverflow.com/questions/ask');
curl_setopt($c, CURLOPT_RETURNTRANSFER, true);
//curl_setopt(... other options you want...)

$html = curl_exec($c);

if (curl_error($c))
    die(curl_error($c));

// Get the status code
$status = curl_getinfo($c, CURLINFO_HTTP_CODE);

curl_close($c);