PHP vs Python: Syntax, Web Use and Which to Learn

PHP and Python are both dynamic, interpreted languages, but they grew up for different jobs. PHP was made for the web: each request runs a .php file that prints a page, and it powers WordPress and Laravel. Python is general purpose: it runs websites too (Django, Flask), and it is the default for data science, scripting and machine learning. For a website or a WordPress job, PHP is the direct route; for almost anything else, Python is the more common choice.

The quickest way to compare them is the same program in both. Here is a small script in PHP, which you can run:

<?php
$scores = ["Ada" => 92, "Linus" => 78, "Grace" => 85];

foreach ($scores as $name => $score) {
    $grade = $score >= 80 ? "pass" : "retry";
    echo "$name: $score ($grade)\n";
}

$average = array_sum($scores) / count($scores);
echo "Average: " . round($average, 1) . "\n";

And the same program in Python:

scores = {"Ada": 92, "Linus": 78, "Grace": 85}

for name, score in scores.items():
    grade = "pass" if score >= 80 else "retry"
    print(f"{name}: {score} ({grade})")

average = sum(scores.values()) / len(scores)
print(f"Average: {round(average, 1)}")

The logic is identical. The visible differences are syntax: PHP marks variables with $, ends statements with ; and uses braces for blocks; Python uses indentation and no sigils.

Syntax side by side

Arrays: one type in PHP, lists and dicts in Python

Python separates lists, dicts, tuples and sets. PHP has one array type, an ordered map, that does all of these jobs. Keys can be integers or strings, and the order you insert in is kept:

<?php
$list = ["red", "green", "blue"];          // like a Python list
$map  = ["red" => "#f00", "blue" => "#00f"]; // like a Python dict

$list[] = "yellow";             // append, like list.append()
$map["green"] = "#0f0";         // add a key

print_r($list);
print_r($map);

echo in_array("blue", $list) ? "has blue\n" : "no blue\n";   // "blue" in list
echo isset($map["red"]) ? "has red key\n" : "no red key\n";  // "red" in dict

The Python version needs two different types:

colors = ["red", "green", "blue"]
codes = {"red": "#f00", "blue": "#00f"}

colors.append("yellow")
codes["green"] = "#0f0"

print("blue" in colors)
print("red" in codes)

PHP's single type is convenient, but it brings one surprise Python does not have: functions such as array_filter keep the original keys, so a filtered list can have gaps (0, 2, 3). Wrap the result in array_values() to renumber it.

Types and type juggling

Both languages are dynamically typed, and both let you add type hints. The big difference is what happens when types mix. Python refuses to add a string and a number; PHP converts numeric strings for you:

<?php
var_dump("10" + 5);        // numeric string becomes a number
var_dump("10" . 5);        // . always joins as strings
var_dump(7 / 2);           // float, but 6 / 2 gives int(3)
var_dump(intdiv(7, 2));    // like 7 // 2 in Python for positive numbers
var_dump("abc" == 0);      // PHP 8: false (PHP 7 said true)
var_dump("1" === 1);       // strict comparison checks the type too

print("10" + 5)   # TypeError: can only concatenate str (not "int") to str
print(7 / 2)      # 3.5
print(7 // 2)     # 3

PHP 8 made comparisons between strings and numbers far saner, but the habit to build is the same: use === in PHP unless you want conversion. With declare(strict_types=1); at the top of a file, PHP also rejects wrong scalar types passed to typed function parameters, which brings it closer to how Python type checkers behave.

Web development

This is where the two differ most. A PHP file is a web page as it stands: put it on a server, and every request runs it from the top, with the form data already in $_GET and $_POST. Run this block, type a city and press Send: the script runs again with $_POST filled in.

<?php
$city = trim($_POST['city'] ?? '');
?>
<form method="post">
    <input name="city" placeholder="Your city" value="<?= htmlspecialchars($city) ?>">
    <button>Send</button>
</form>
<?php if ($city !== ''): ?>
    <p>Weather lookup for <strong><?= htmlspecialchars($city) ?></strong> would go here.</p>
<?php endif; ?>

Python needs a framework and a running application server for the same page. A minimal Flask version:

from flask import Flask, request
from markupsafe import escape

app = Flask(__name__)

@app.route("/", methods=["GET", "POST"])
def home():
    city = request.form.get("city", "").strip()
    page = '<form method="post"><input name="city"><button>Send</button></form>'
    if city:
        page += f"<p>Weather lookup for <strong>{escape(city)}</strong></p>"
    return page

Neither model is better in general. PHP's "one request, one fresh run" is simple to deploy and hard to break: a crash affects one request, and memory is cleaned up after every page. Python's long-running app process can keep things in memory between requests and suits websockets and background work, but needs more setup. Full frameworks (Laravel and Symfony in PHP, Django in Python) end up offering similar features: routing, an ORM, templates, authentication, queues.

Performance

For web pages, PHP 8 with OPcache is generally quicker than CPython at running plain code, and PHP 8 also ships a JIT compiler. In practice both spend most of a request waiting on the database or other services, so the difference rarely decides a project. Python's speed story is different: heavy numeric work is done by libraries such as NumPy and pandas, whose cores are written in C, which is why Python leads in data work despite a slower interpreter.

Where each one is used

Job markets reflect this. PHP roles are mostly web development, often WordPress or Laravel. Python roles span web, data, DevOps and ML, so there are more of them.

Which to learn first

Pick by what you want to build in the next few months:

• You want to build websites, freelance, or work with WordPress: learn PHP. You will have a page online quickly, and the skills map directly onto paid work. Start with what PHP is and variables.
• You want data analysis, automation, AI, or a general first language: learn Python.
• You want to build modern web apps end to end: either works for the backend, and you will need JavaScript for the browser anyway; see PHP vs JavaScript.

Most of what you learn transfers. Loops, functions, arrays and maps, classes and exceptions work almost the same way in both, so the second language takes weeks, not months.