5 PHP short If / Else (PHP 7.x: kurze If / Else - Abfrage)

# 1. Classic # 2. Weird # 3. With Breaks # 4. Short # 5. Even Shorter 1.) Classic =========== <?php if($foo) { // $foo } else { // empty } ?> 2.) Weird ========= <?php if($foo): // $foo else: // empty endif; ?> 3.) With Breaks =============== <?php if($foo): ?> <!-- $foo --> <? else: ?> <!-- empty --> <? endif; ?> 4.) Short ========= <?php echo $foo ? $foo : 'fallback'; // is $foo empty echo !empty($foo) ? $foo : 'empty'; // $foo or 'empty' // is 5 greater than 1? echo 5 > 1 ? 'yes' : 'no'; // 'no' // Does 'a' equal 'b'? echo 'a' == 'b' ? 'equals' : 'no'; // 'no' ?> 5.) Even Shorter =================================== "The null coalescing operator (??) has been added as syntactic sugar for the common case of needing to use a ternary in conjunction with isset(). It returns its first operand if it exists and is not NULL; otherwise it returns its second operand." – from: https://www.php.net/manual/en/migration70.new-features.php#migration70.new-features.null-coalesce-op) <?php echo $foo ?: 'fallback'; // $foo or 'fallback', also called "Elvis operator", equals `$foo ? $foo : 'fallback'` echo !empty($foo) ?: 'fallback'; // $foo or 'fallback', also called "Elvis operator", equals `!empty($foo) ? $foo : 'fallback'` echo $foo ?? 'fallback'; // $foo or 'fallback', equals `isset($foo) ? $foo : 'fallback'` ?> 6.) Other Fancy Stuff aka Spaceship operator ============================================ "The spaceship operator is used for comparing two expressions. It returns -1, 0 or 1 when $a is respectively less than, equal to, or greater than $b. Comparisons are performed according to PHP's usual type comparison rules." – https://www.php.net/manual/en/migration70.new-features.php#migration70.new-features.spaceship-op <?php // Integers echo 1 <=> 1; // 0 echo 1 <=> 2; // -1 echo 2 <=> 1; // 1 // Floats echo 1.5 <=> 1.5; // 0 echo 1.5 <=> 2.5; // -1 echo 2.5 <=> 1.5; // 1 // Strings echo "a" <=> "a"; // 0 echo "a" <=> "b"; // -1 echo "b" <=> "a"; // 1 ?>