PHP · Theory

String Functions

Theory

40/352

String Functions

String Functions is a PHP topic. In plain words you use it for function add($a, $b) in a marks helper. Don’t start with a slogan — start with that picture.

Smallest example: function name($x) { return $x; }. Type it, run it, and say what you see. If you can do that from memory, you know String Functions.

From the example next to this theory — String Functions — typed params and return types make PHP APIs clearer.

Trap — no return so the caller gets null. Fix that before you talk about advanced PHP.

Viva — what is String Functions? Then show function name($x) { return $x; }. Then name the trap.

Exam tip

What is String Functions? Show this: function name($x) { return $x; }. Trap: no return so the caller gets null.

Example

<?php
function greet(string $name, int $n = 1): string {
  return str_repeat("Hi $name! ", $n);
}
echo greet("Asha");
echo greet("Dev", 2);

String Functions — typed params and return types make PHP APIs clearer.

Short notes

DefString Functions — function add($a, $b) in a marks helper.
Rulefunction name($x) { return $x; }
Trapno return so the caller gets null
Usea marks helper

PHP · Theory

String Functions

← All stacks

Theory

40/352

String Functions

String Functions is a PHP topic. In plain words you use it for function add($a, $b) in a marks helper. Don’t start with a slogan — start with that picture.

Smallest example: function name($x) { return $x; }. Type it, run it, and say what you see. If you can do that from memory, you know String Functions.

From the example next to this theory — String Functions — typed params and return types make PHP APIs clearer.

Trap — no return so the caller gets null. Fix that before you talk about advanced PHP.

Viva — what is String Functions? Then show function name($x) { return $x; }. Then name the trap.

Exam tip

What is String Functions? Show this: function name($x) { return $x; }. Trap: no return so the caller gets null.

Example

<?php
function greet(string $name, int $n = 1): string {
  return str_repeat("Hi $name! ", $n);
}
echo greet("Asha");
echo greet("Dev", 2);

String Functions — typed params and return types make PHP APIs clearer.

Short notes

DefString Functions — function add($a, $b) in a marks helper.
Rulefunction name($x) { return $x; }
Trapno return so the caller gets null
Usea marks helper

String Functions

Example

Short notes

Questions

String Functions

Example

Short notes

Questions