PHP functions

php_functions.php

// TYPES

define("NAME", "copycut"); // const
$int = 1;
$float = 1.1;
$bool = true;
$string = "hello";
$array = array();


// PRINT THINGS

echo ...        // Array
echo($var);     // Array
print($var);    // Array
print_r($var);  // Array( [0] => copycut )
var_dump($var); // array(1) { [0]=> string(6) "copycut" }

$example_ar = array("copycut", 43, 2.5, true);
print_r($example_ar);  // Array ( [0] => didier [1] => 43 [2] => 2.5 [3] => 1 )
var_dump($example_ar); // array(4) { [0]=> string(6) "copycut" [1]=> int(43) [2]=> float(2.5) [3]=> bool(true) }


// GET TYPES

gettype($int);  //-> integer

// STRINGS

$hello = "hello";
echo $hello;    //-> print hello (without quotes)
echo $hello{0}; //-> print h

// ARRAYS

$ar = array("name", "age", "birthday"); // example
$ar2 = array(42, "green", 3.14, true); // mix data types

echo $ar[0];           //-> print name

$ar[0] = "fitst_name"; //-> modify value

$ar[] = "location";    //-> push a item in the array end


// CHECKS
echo(true === TRUE);     // 1
var_dump(true === TRUE)  // bool(true)
var_dump($var)           // explode var
var_dump((bool) $var)    // return true or flase
isset($var)              // return true or false