PHP

Cheat Sheets

Usefull Informations

Official Documentation - Phpnet

About PHP
../../_images/phpnet.PNG ../../_images/browse_website2.png

Type of Language: Imperative, Object-Oriented

Born in: 1994

Caracteristics: Simple, permissive, html inbedded

Popularity: 5.85% (5th) src

Usefull for: website backend, database linking

Misc: …

Types and Variables

Note

variable typing is automatic in PHP

Name

Expression

Size

Min

Max

Boolean

$foo = true;

1 bits

0 (false)

1 (true)

Int

$foo = 1234;

32+ bits

-9.223e+15

9.223e+15

Float/Double

$foo = 1.24;

32+ bits

accuracy 1.11e-16

String

echo 'test';

32+ bits

64-bits => no restriction, else 1.6e+10

Tip

It’s also possible do define the type like $foo = (double)4; or like settype($foo,'double');

Input Output

<?php
        $age = 18;
        var_dump($age); // => int(18)
        echo gettype($age); // => integer

        define("MAX",10);
        echo('he is '.$age.'years old');
        $input = trim(fgets(STDIN));

Variables, Tests and Loops

TESTS IF

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<?php
        if (Condition) {
                // Action
        }

        if (Condition) {
                // Action
        } elseif (Condition) {
                // Action
        } else {
                // Action
        }

        if(Condition)
                // Action

        ($a == $b); // test equality of value
        ($a === $b); // test equality of value AND type
SWITCH

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<?php
        switch (variable) {
                case 1: // Action
                        break;
                case 2: // Action
                        break;
                case 3: // Action
                        break;
}
LOOPS

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<?php
        for ($i=0; $i<10; $i++) {
                // Action
        }

        do {
                // Action
        } while($i > 0);

        while ($i > 0) {
                // Action
        }

        foreach ($items as $item) {
                // Action
        }

Tip

You can use break; to stop a loop.

Random numbers

RANDOMS

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<?php
        define("MIN", 0);
        define("MAX", 100);

        $alea = rand(MIN,MAX); // alias of mt_rand(MIN,MAX) since PHP 7.1.0

Arrays

ARRAYS

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<?php
        $table = array("E1"=>0, "E2"=>6, "E3"=>5);
        $table['E1'] = 10;
        $table['E2'] = 13;
        $table['V1'] = 5;

        echo($table['E1']); // 10

        foreach ($table as $key => $value) {
                echo ("$key : $value \n");
        }

        for($i=0; $i<count($table);$i++) {
                echo $test[$i;]
        }

        print_r($table);

        /*
        Array
        (
            [E1] => 10
            [E2] => 13
            [E3] => 5
            [V1] => 5
        )
        */

        $test = array(10, 15, 20);
        count($test); // 3
ARRAYS OPERATORS

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<?php
        $array_a = array(...);
        $array_b = array(...);

        $array_a + $array_b // union of a and b
        array_merge($array_a, $array_) // addition of items
        array_intersect($array_a, $array_) // intersection of items

        min($array_a); // return the min elem
        max($array_a); // return the max elem
        array_sum($array_a, $array_b); // return the sum of elem
        in_array("test", $array_a); // search and return true/false
        array_search("test", $array_a); // search and return the position
        array_shift($array_a); // extract the first value
        array_pop($array_a); // extract the last value

        echo(round(6.1234, 2)); // 6.12
        echo(pow(5,2)); // 25

        array_slice($array,2,1);
STRINGS

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<?php
        $string = 'my String';
        echo('length: ' . strlen($string)); // length: 9

        echo('substr 0 7: ' . substr($string, 0, 7)); // substr 0 7: my Stri
        echo('substr 1 1: ' . substr($string, 2, 2)); // substr 1 1: y
        echo('substr 1: ' . substr($string, 1)); // substr 1: y String

        echo('strpos S: ' . strpos($string, "S")); // strpos S: 3 (First occurence)
        echo('strpos s: ' . strpos($string, "s")); // strpos s: false (Case sensitive)
        echo('stripos s: ' . stripos($string, "s")); // stripos s: 3 (Not case sensitive)
        echo('strrpos s: ' . strrpos($string, "s")); // strrpos s: 3 (Last occurence)

        echo('lower: ' . strtolower($string)); // lower: my string
        echo('upper: ' . strtoupper($string)); // upper: MY STRING

        echo('first maj: ' . ucfirst($string)); // first maj: My String
        echo('first min: ' . lcfirst($string)); // first min: my string

        explode(" ", $chain);
FILTER

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<?php
        filter_var($mail, FILTER_VALIDATE_EMAIL);
        $verification = preg_match($pattern, $string);

$

end chain

^

begin chain

.

anything

{1}

exact number

[a-z]

chars

[^b]

not char
FOLDERS

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<?php
        $handle = fopen("file.txt","r"); // pointer or false
        if ($handle) {
                while ($buffer = fgets($handle,2) != false) { // return the line of a defined size
                        echo $buffer;
                }
        }
        fwrite($handle, $string);
        fclose($handle);

        file($filename [, FILE_IGNORE_NEW_LINES / FILE_SKIP_EMPTY_LINES]); // return file in array

r

read from beggining

r+

writing from end

w

reset and write

a

reate or write from end
DATE

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<?php
        date_default_timezone_set('Europe/Paris');
        date('Y')/date('m')/date('d');

Functions

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<?php
        function say($text[, $language="EN"]) {
                echo($text);
                return $language;
        }

Embedded PHP

Post/Get

FORM

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<form id="inscription" method="post" action="form.php">
        <p>
                <label for="name">Name:</label>
                <input type="text" name="name" id="name">
        </p>
        <input type="submit" name="validate" id="validate" value="Send"/>
</form>

TODO

Text Input

  • value: displayed value

  • size: handler size

  • name: datas in php

  • placeholder: information

  • maxlength: max enabled

  • title: hovering info

  • required: needed to validate

  • pattern =”^[A-Za-z]+$”

TextArea Input

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<textarea name="area" id="area" rows="10" cols="10">
        default text
</textarea>
Radio Input

  • value: 0 or 1

  • checked: default

Checkbox Input

  • name=”array[]”

Select Input

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<select name="departement" id="departement">
        <option value="choice A">Choice A</option>
        <option value="choice B">Choice B</option>
        <option value="choice C">Choice C</option>
</select>
Special Inputs

  • url

  • email

  • number

  • tel

  • date

  • time

  • search

  • color

  • range

FieldSet

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<fieldset>
        <legend> Legend </legend>

        <!-- FORM -->

</fieldset>
Datas

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<?php

        print_r($_POST);
        echo ("Hello ".$_POST["name"]);

        if (isset($_POST["sports"] as $sport)) {
                echo "<ul>";
                foreach ($_POST["sports"] as $sport) {
                        echo "<li> $sport </li>";
                }
                echo "</ul>";
        }
Include in same page

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<?php

        if (!empty($_POST[])) {
                include_once("file.php");
        }
Dynamic variable

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<?php
        $names = array('name','surname');

        foreach ($names as $name) {
                $$name = $_POST[$name];
        }

        echo $name; // instead of echo $_POST["name"];
        echo $surname;

MVC

Todo

Mvc

Laravel

Todo

Laravel