Operatori booleani in PHP

Un semplice esempio che mostra la differenza tra && – and e || – or

<?php

/**
 * AND
 */
echo '&&' . "\n";
$bool = true && false;
echo 'true && false: ' . (int)$bool . "\n";// false

$bool = false && true;
echo 'false && true: ' . (int)$bool . "\n"; // false

echo 'AND' . "\n";

$bool = true and false;
echo 'true and false: ' . (int)$bool . "\n"; // true

$bool = false and true;
echo 'false and true: ' . (int)$bool . "\n"; // false


/**
 * OR
 */
echo '||' . "\n";
$bool = true || false;
echo 'true || false: ' . (int)$bool . "\n"; // true

$bool = false || true;
echo 'false || true: ' . (int)$bool . "\n"; // true

echo 'OR' . "\n";
$bool = true or false;
echo 'true or false: ' . (int)$bool . "\n"; // true

$bool = false or true;
echo 'false or true: ' . (int)$bool . "\n"; // false

Di seguito l’output:

&&
true && false: 0
false && true: 0
AND
true and false: 1
false and true: 0
||
true || false: 1
false || true: 1
OR
true or false: 1
false or true: 0

Reference: qui