Bloques de códigos sencillos en PHP

You don't have access to this class

Keep learning! Join and start boosting your career

If you already have an account,

Resources

What are PHP code blocks?

PHP is an essential language in web development, as it facilitates the creation of dynamic pages and robust applications. In this context, code blocks are fundamental to control the flow of the program, allowing you to make decisions and execute code in a repetitive or conditional manner. Let's see how you can use them effectively.

How are if and else control structures used?

In PHP, the if structure is crucial for decision making. A block of code is executed if a set condition is met. For example:

if ($condition) { // Code to execute if $condition is true}

Additionally, you can extend it with else if and else to handle multiple conditions:

if ($firstCondition) { // Code if $firstCondition is true} elseif ($secondCondition) { // Code if $secondCondition is true} else { // Code if none of the above conditions is true}

How do you use switch for more orderly decisions?

When you handle multiple conditions to evaluate on a single variable, switch is a more organized choice than if-else. Each case within the switch acts as a condition:

switch ($variable) { case "value1": // Code for case value1 break; case "value2": // Code for case value2 break; default: // Code if no match break;}

This structure makes your code easier to read and maintain, especially when you have to handle many conditions.

What are for and foreach loops for?

Loops are essential for repeating code execution multiple times. The for loop is useful when you know the number of iterations needed:

for ($i = 0; $i <= 10; $i++) { // Code to execute ten times}

On the other hand, foreach is ideal for iterating over arrays or collections of data, such as arrays:

foreach ($array as $key => $value) { // Code that uses $key and $value}

What is the difference between while and do-while?

Both loops are used to execute code while a condition is met, although they have their differences:

while: evaluates the condition before each iteration, which can cause it to never execute if the condition is false from the beginning.

while ($condition) { // Code to execute while $condition is true}

do-while: ensures that the code block is executed at least once, since the condition is evaluated at the end.

do { // Code to execute at least once} while ($condition);

Why are code blocks essential to PHP?

Code blocks are the heart of any effective PHP application. They allow you to alter the natural flow of execution that the system follows, from top to bottom, making decisions and iterating according to the needs of the program. Learning to use them effectively is crucial to developing complex applications and making use of advanced tools such as Composer.

Keep exploring and practicing to master PHP and take your skills to the next level!

Contributions 73

Questions 7

Sort by:

Want to see more contributions, questions and answers from the community?

Juan Esteban Galvis

5 years ago

RESUMEN:

Condición:
Digamos que se desea validar si una persona es mayor de edad (Mayor a 18 años)

if ($edad >= 18) {
    echo "ES MAYOR DE EDAD";
} else {
    echo "ES MENOR DE EDAD";
}

Switch:
Digamos que tenemos Opción 1,2 o 3 en vez de hacer un if por cada opción hacemos:

switch ($opcionEscogida) {
    case 1:
        echo "ELIGIÓ LA OPCIÓN 1";
        break;
    
    case 2:
        echo "ELIGIÓ LA OPCIÓN 2";
        break;

    case 3:
        echo "ELIGIÓ LA OPCIÓN 3";
        break;
    
    default:
        echo "ELIGIÓ UNA OPCIÓN DIFERENTE";
        break;
}

For
Se utiliza este ciclo si sabemos exactamente cuántas repeticiones necesitamos, por ejemplo los números del 1 al 5:

for ($i=1; $i < 6; $i++) { 
    echo $i
}

// RESULTADO: 12345

While
Si no conocemos cuántas repeticiones usamos este ciclo:

while ($opcion != 0) {
    echo "ESTE CICLO NO ACABA HASTA QUE Opcion sea diferente a 0";
}

Extra: if simplificado
Podemos hacer un if sencillo en una sola línea de la siguiente manera:

// Condición ? Si es Verdadero : Si es Falso ;
echo true ? "CUMPLE LA CONDICIÓN" : "NO CUMPLE LA CONDICIÓN";

RetaxMaster

5 years ago

Muchos de los bloques de código mostrados aquí se explican en el Curso Gratuito de Programación Básica

En el caso del foreach, es algo “exclusivo” de PHP, básicamente, comparando con JavaScript, cuando tu pones un foreach con el “as $key” es como si tuvieras un for…in en JavaScript, si pones un foreach SIN el “as $key” es como si tuvieras un for…of en JavaScript

Jairo Jair Jasón Pozo Pérez