Ausdrücke (expressions) in PHP
Ausdrücke werden aus Operatoren, Operanden und Klammern gebildet. Z.B. sind $a+5 oder $a<5 Ausdrücke. Der erste Ausdruck hat einen Zahlenwert, der zweite kann den Wert TRUE oder FALSE haben. Vereinfacht könnte man formulieren: "Ein Ausdruck ist irdendetwas, das einen Wert hat". Es gibt- arithmetische Ausdrücke
- logische Ausdrücke
- Vergleichsausdrücke
- Zeichenketten-Ausdrücke
- Arithmetische Operatoren
- String Operator
- Bit Operatoren
- Logische Operatoren
- Vergleichsoperatoren
- Inkrementoperatoren
Arithmetische Operatoren
| example | name | result |
|---|---|---|
| $a + $b | Addition | Sum of $a and $b. |
| $a - $b | Subtraction | Remainder of $b subtracted from $a. |
| $a * $b | Multiplication | Product of $a and $b. |
| $a / $b | Division | Dividend of $a and $b. |
| $a % $b | Modulus | Remainder of $a divided by $b. |
String Operator
| example | name | result |
|---|---|---|
| "Hello " . "world!" | Concatenation | Hello world! |
Bit Operatoren
| example | name | result |
|---|---|---|
| $a & $b | And | Bits that are set in both $a and $b are set. |
| $a | $b | Or | Bits that are set in either $a or $b are set. |
| ~ $a | Not | Bits that are set in $a are not set, and vice versa. |
Logische Operatoren
| example | name | result |
|---|---|---|
| $a and $b | And | True of both $a and $b are true. |
| $a or $b | Or | True if either $a or $b is true. |
| $a xor $b | Or | True if either $a or $b is true, but not both. |
| ! $a | Not | True if $a is not true. |
| $a && $b | And | True of both $a and $b are true. |
| $a || $b | Or | True if either $a or $b is true. |
Vergleichsoperatoren
| example | name | result |
|---|---|---|
| $a == $b | Equal | True if $a is equal to $b. |
| $a != $b | Not equal | True if $a is not equal to $b. |
| $a < $b | Less than | True if $a is strictly less than $b. |
| $a > $b | Greater than | True if $a is strictly greater than $b. |
| $a <= $b | Less than or equal to | True if $a is less than or equal to $b. |
| $a >= $b | Greater than or equal to | True if $a is greater than or equal to $b. |