Operators:

PHP Operator is a symbol i.e used to perform operations on operands. In simple words, operators are used to perform operations on variables or values. For example:

    $num=10+20;//+ is the operator and 10,20 are operands and $num is variable 

In the above example, + is the binary + operator, 10 and 20 are operands and $num is variable.

1. Arithmetic Operators
2. Assignment Operators
3. Bitwise Operators
4. Comparison Operators
5. Incrementing/Decrementing Operators
6. Logical Operators
7. String Operators
8. Array Operators
9. Type Operators
10. Execution Operators
11. Error Control Operators

• Unary Operators: works on single operands such as ++, -- etc.
• Binary Operators: works on two operands such as binary +, -, *, / etc.
• Ternary Operators: works on three operands such as "?:".

Question

 
 Consider the following code:
 
 $str1 = 'yabadabadoo';
 $str2 = 'yaba';
		if (strpos($str1,$str2)) {
			echo "\"" . $str1 . "\" contains \"" . $str2 . "\"";
		} else {
			echo "\"" . $str1 . "\" does not contain \"" . $str2 . "\"";
		}
output:"yabadabadoo" does not contain "yaba"

What will be the output of the code below and why?

    $x = 5;
	$x = 5;
	echo $x;
	echo "
";
	echo $x+++$x++;
	echo "
";
	echo $x;
	echo "
";
	echo $x---$x--;
	echo "
";
	echo $x;
	output:
		5
		11
		7
		1
		5
		
		
What will be the values of $a and $b after the code below is executed? Explain your answer.
$a = '1';
$b = &$a;
$b = "2$b";
 

The bitwise operators are used to perform bit-level operations on operands. These operators allow the evaluation and manipulation of specific bits within the integer.

Comparison operators allow comparing two values, such as number or string. Below the list of comparison operators are given:

The increment and decrement operators are used to increase and decrease the value of a variable.

The logical operators are used to perform bit-level operations on operands. These operators allow the evaluation and manipulation of specific bits within the integer.

The string operators are used to perform the operation on strings. There are two string operators in PHP, which are given below:

The array operators are used in case of array. Basically, these operators are used to compare the values of arrays.

The type operator instanceof is used to determine whether an object, its parent and its derived class are the same type or not. Basically, this operator determines which certain class the object belongs to. It is used in object-oriented programming.

 //class declaration  
    class Developer  
    {}  
    class Programmer  
    {}  
    //creating an object of type Developer  
    $charu = new Developer();  
      
    //testing the type of object  
    if( $charu instanceof Developer)  
    {  
        echo "Charu is a developer.";  
    }  
    else  
    {     
        echo "Charu is a programmer.";  
    }  
    echo "
";  
    var_dump($charu instanceof Developer);           //It will return true.  
    var_dump($charu instanceof Programmer);       //It will return false.  
	
	output:
	Charu is a developer.
    bool(true) bool(false)
 

PHP has an execution operator backticks (``). PHP executes the content of backticks as a shell command. Execution operator and shell_exec() give the same result.

PHP has one error control operator, i.e., at (@) symbol. Whenever it is used with an expression, any error message will be ignored that might be generated by that expression.