Guard Clause Example In PHP

guard_ex2.php

<?php

function saveProfile($data) {
  $errors = [];
  
  if (!isset($data['email'])) {
    $errors[] = 'Email address is required';
  } else {
    if (!filter_var($data['email'], FILTER_VALIDATE_EMAIL)) {
      $errors[] = 'Email address is not valid';
    }
  }
  
  if (count($errors) > 0) {
    return ['success' => false, 'errors' => $errors];
  }
  
  // Save the profile to the database
  // ...
  
  return ['success' => true];
}

// How about like that?

function saveProfile($data) {
  $errors = [];
  
  if (!isset($data['email'])) {
    $errors[] = 'Email address is required';
    return ['success' => false, 'errors' => $errors]; // guard clause for missing email
  }
  
  if (!filter_var($data['email'], FILTER_VALIDATE_EMAIL)) {
    $errors[] = 'Email address is not valid';
    return ['success' => false, 'errors' => $errors]; // guard clause for invalid email
  }
  
  // Save the profile to the database
  // ...
  
  return ['success' => true];
}