Operator ist ein Symbol oder kann eine Reihe Symbole sein, die, wenn sie mit etwas Werten verwendet werden, etwas T�tigkeit durchf�hrt und einen neuen Wert produziert.

Assignment Operator

Assignment operator "=" is most widely used operator in PHP. This operator is used to initialize the variable.This operator is used in between two operands. It evaluates right-hand operand and assigs its value to the left-hand operand. Most operators are used to produce some result without changing the value of their operands. But assignment operator breaks this rule.

print ($name = �John�); //assigns �John� to �$name�, then
outputs �$name�

At the same time you can perform multiple things. So you can assign not only the word �John� to the variable �$name�, but can also output the variable at (almost) the same time..

Dot Operator

Using the concatenation operator we can append additional characters to a string. This is a single dot �.�. Treating both operands as the string types, it appends the right-hand operand to the left-hand operand, the result is ofcourse, a string.

$first_name = �John�;
$last_name = �Davis�;
print $first_name . $last_name; //outputs �John Davis�

Arithmetic Operators

Arithmetic operators are also used in many programming languages. You know for sure what each of them do, so we�ll just stick to point them out: addition �+�, subtraction �-�, division �/�, multiplication �*�, and modulus �%�.

<?php

/* define some variables */
$mean = 5;
$median
$mode = 9;

//post-increment operator
$mean++;
//$mean now equals 6

//pre-increment operator
++meanx;
//$mean is now 7

//post-decrement operator
$mean--;
//$mean is down to 6

//pre-decrement operator
--$mean;
//$mean is down to 5

//addition operator
$median = $mean + $mode;
//$median now equals 14

//substraction operator
$median = $mode - $mean;
//$median now equals 4

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Vergleich Operators

Du hast bereits einige der Arithmetik- und Zeichenketteoperatoren in PHP gesehen. Jedoch kommt die Sprache auch mit Operatoren, die spezifisch entworfen sind, um zwei Werte zu vergleichen: Diese Operatoren werden �Vergleich Operatoren� angerufen. Ist hier ein Beispiel demonstriert Vergleich Operatoren in der T�tigkeit:

<?php

/* define some variables */
$mean = 9;
$median = 10;
$mode = 9;

// less-than operator
// returns true if left side is less than right
// returns true here
$result = ($mean < $median);
print "result is $result ";

// greater-than operator
// returns true if left side is greater than right
// returns false here
$result = ($mean > $median);
print "result is $result ";

// less-than-or-equal-to operator
// returns true if left side is less than or equal to right
// returns false here
$result = ($median <= $mode);
print "result is $result ";

// greater-than-or-equal-to operator
// returns true if left side is greater than or equal to right
// returns true here
$result = ($median > = $mode);
print "result is $result ";

// equality operator
// returns true if left side is equal to right
// returns true here
$result = ($mean == $mode);
print "result is $result ";

// not-equal-to operator
// returns true if left side is not equal to right
// returns false here
$result = ($mean != $mode);
print "result is $result ";

// inequality operator
// returns true if left side is not equal to right
// returns false here
$result = ($mean <> $mode);
print "result is $result";

php?>