Dev {Tricks}

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For Loop | While Loop | Do…While Loop | Foreach Loop

For Loop

Used when you know in advance how many times you want to execute a statement or a block of
statements.

for($x = 0; $x <= 5; $x++) {
    echo "The number is: $x";
}

While Loop

It executes a block of code as long as the specified condition is true.

$x = 1;
while($x <= 5) {
    echo "The number is: $x ";
    $x++;
}

Do…While Loop

$x = 1;
do {
    echo "The number is: $x ";
    $x++;
} while ($x <= 5);

Foreach Loop

Used for looping through arrays. For each loop iteration, the value of the current array element is
assigned to the value variable and the array pointer is moved by one, until it reaches the last array
element.

$colors = array("red", "green", "blue", "yellow");
foreach ($colors as $value) {
    echo "$value";
}
$age = array("Peter" => "35", "Ben" => "37", "Joe" => "43");
foreach($age as $key => $value) {
    echo "$key is $value years old. ";
}

 

 

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Strict mode in PHP

Strict mode in PHP

  • Affects how type hints are enforced.
  • By default, PHP will try to coerce values of the wrong type to match the expected type.
  • In strict mode, PHP will throw a TypeError if the provided value does not exactly match the expected type.
declare(strict_types=1);

function add(int $a, int $b): int {
return $a + $b;
}
echo add("5", "10")

 

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PHP Function Return Types

Basic Return Types

function getAge(): int {
    return 25;
}
function isAdult(int $age): bool {
    return $age >= 18;
}
echo getAge();
echo isAdult(11)

Nullable Return Type

function findUsername(int $id): ?string {
    if ($id === 1) {
    return "JohnDoe";
    }
    return null; // It's valid because of the ? before string
}
echo findUsername(2);

Return Type of void

function logMessage(string $message): void {
    echo $message;
}
logMessage("Hello");

Union Return Types

function sum($num1,$num2):int|string{
    return $num1+$num2;
}
echo sum("33","20");

 

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PHP Anonymous Functions (or Closures)

Anonymous Functions (or Closures)

  • These are functions without a name. They can be stored in variables or passed as arguments to other
    functions.

Creation & Execution Directly.

// Anonymous Functions (or Closures)

(function(){
echo "Hello Anonymous";
}) ();

 

 

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PHP Variadic Functions

Variadic Functions

  • Functions that accept an indefinite number of arguments.
  • They use the (…) spread operator
// Variadic Functions
// spread operator is ...
// spread operator does not support echo

function WorldCountryList(...$country){
print_r($country);
}
WorldCountryList("Bangladesh","India","Nepal");