Bisherigen Sucheinträge:
language functions ,
include functions ,
variable functions ,
post functions
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Vergleichs-Operatoren erlauben es - wie der Name schon sagt - zwei Werte zu vergleichen. Wenn Sie an Beispielen verschiedener auf Typen bezogener Vergleiche interessiert sind, können Sie sich PHP type comparison tables anschauen.
| Beispiel | Name | Ergebnis |
|---|---|---|
| $a == $b | Gleich | Gibt TRUE zurück, wenn $a gleich $b ist. |
| $a === $b | Identisch | Gibt TRUE zurück wenn $a gleich $b ist und beide vom gleichen Typ sind (eingeführt in PHP 4). |
| $a != $b | Ungleich | Gibt TRUE zurück, wenn $a nicht gleich $b ist. |
| $a <> $b | Ungleich | Gibt TRUE zurück, wenn $a nicht gleich $b ist. |
| $a !== $b | Nicht identisch | Gibt TRUE zurück, wenn $a nicht gleich $b ist, oder wenn beide nicht vom gleichen Typ sind (eingeführt in PHP 4). |
| $a < $b | Kleiner Als | Gibt TRUE zurück, wenn $a kleiner als $b ist. |
| $a > $b | Größer Als | Gibt TRUE zurück, wenn $a größer als $b ist. |
| $a <= $b | Kleiner Gleich | Gibt TRUE zurück, wenn $a kleiner oder gleich $b ist. |
| $a >= $b | Größer Gleich | Gibt TRUE zurück, wenn $a größer oder gleich $b ist. |
Ein weiter Vergleichs-Operator ist der "?:"- oder Trinitäts-Operator.
<?php
// Beispielanwendung für den Trinitäts-Operator
$action = (empty($_POST['action'])) ? 'standard' : $_POST['action'];
// Obiges ist mit dieser if/else-Anweisung identisch
if (empty($_POST['action'])) {
$action = 'standard';
} else {
$action = $_POST['action'];
}
?>
Siehe auch strcasecmp(), strcmp(), Array-Operatoren und den Abschnitt über Typen.
Another conditional operator is the "?:" (or ternary) operator.
Beispiel #1 Assigning a default value
<?php
// Example usage for: Ternary Operator
$action = (empty($_POST['action'])) ? 'default' : $_POST['action'];
// The above is identical to this if/else statement
if (empty($_POST['action'])) {
$action = 'default';
} else {
$action = $_POST['action'];
}
?>
Since PHP 5.3, it is possible to leave out the middle part of the ternary operator. Expression expr1 ?: expr3 returns expr1 if expr1 evaluates to TRUE, and expr3 otherwise.
Hinweis: Please note that the ternary operator is a statement, and that it doesn't evaluate to a variable, but to the result of a statement. This is important to know if you want to return a variable by reference. The statement return $var == 42 ? $a : $b; in a return-by-reference function will therefore not work and a warning is issued in later PHP versions.
Hinweis: It is recommended that you avoid "stacking" ternary expressions. PHP's behaviour when using more than one ternary operator within a single statement is non-obvious:
Beispiel #2 Non-obvious Ternary Behaviour
<?php
// on first glance, the following appears to output 'true'
echo (true?'true':false?'t':'f');
// however, the actual output of the above is 't'
// this is because ternary expressions are evaluated from left to right
// the following is a more obvious version of the same code as above
echo ((true ? 'true' : 'false') ? 't' : 'f');
// here, you can see that the first expression is evaluated to 'true', which
// in turn evaluates to (bool)true, thus returning the true branch of the
// second ternary expression.
?>
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