PHP commutateur Déclaration
Les instructions conditionnelles sont utilisées pour effectuer des actions différentes en fonction des conditions différentes.
L'instruction switch PHP
Utilisez l'instruction switch pour sélectionner l'un des nombreux blocs de code à exécuter.
Syntaxe
switch (n)
{
case label1:
code to be executed if n=label1;
break;
case label2:
code to be executed if n=label2;
break;
default:
code to be executed if n is different from both label1 and label2;
}
{
case label1:
code to be executed if n=label1;
break;
case label2:
code to be executed if n=label2;
break;
default:
code to be executed if n is different from both label1 and label2;
}
C'est comment cela fonctionne: D'abord nous avons une seule expression n (le plus souvent une variable), qui est évaluée une fois. La valeur de l'expression est ensuite comparé avec les valeurs pour chaque cas dans la structure. S'il ya un match, le bloc de code associé à ce cas est exécuté.Utilisez casser pour empêcher l'exécution du code dans le cas suivant automatiquement. La déclaration par défaut est utilisé si aucune correspondance n'est trouvée.
Exemple
<html>
<body>
<?php
$x=1;
switch ($x)
{
case 1:
echo "Number 1";
break;
case 2:
echo "Number 2";
break;
case 3:
echo "Number 3";
break;
default:
echo "No number between 1 and 3";
}
?>
</body>
</html>
<body>
<?php
$x=1;
switch ($x)
{
case 1:
echo "Number 1";
break;
case 2:
echo "Number 2";
break;
case 3:
echo "Number 3";
break;
default:
echo "No number between 1 and 3";
}
?>
</body>
</html>
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