In this tutorial, we will lean Operators in PHP. Operators are special symbols which tell to PHP processor to do some special operations. For example, There is + operator which tells PHP Processor to add two numbers (4+5). There are various operators in PHP and they are divided into some categories. List of Categories:
- Arithmetic Operators
- Comparison Operators
- Assignment Operators
- Inc/Dec Operators
- Logical Operators
- String Operators
- Array Operators
Now we will learn about each category in detail. We will learn which operators are in each category and how do they work.
There is a total of five operators in this category. Arithmetic operators are used to performing some basic mathematical operations. Operators in this category are +,-, /, *, %. Checklist of Arithmetic Operators.
|+||Addition||Add Two Number||10+5|
|–||Subraction||Subtract second number from first umber||10-5|
|*||Multiplication||Multiply Two Number||10*5|
|/||Division||Division of Two Number||10/5|
|%||Modulus||Return Remainder after Devision||10%5|
Comparisons operators are used to comparing two numbers. For example to check which number is greater from giver number(10>5). Result of comparison operators come in Boolean form mean 10>5 result of this would be true. List of operators in this category is as follow.
|==||Equal||Return true if first value would equal to second||10==10|
|===||Identical||Return true if both operands would be of same data type||10===10|
|!=||Not equal||Return true if both values are not same||10!=5|
|!==||Not identical||Return true if both values would not be of same type.||10!===5|
|<||Less than||Return true if first value will be less than second||10<20|
|>||Greater than||Return true if first value will greater than second||10>5|
|<=||Less than or equal to||Return true if first value will be less than or equal to second||10<=5|
|>=||Greater than or equal to||Return true if first value will be greater than or equals to second||10>=5|
The most common Assignment operator is =. Assignment operators are used to assigning value to variables. There is a total of six assignment operators check this list.
|=||Assign||assign value to variables||$num=10|
|+=||Add and assign||Assign value to variable after adding value on right hand side in previous value of variable||num+=10 ($num = $num+10)|
|-=||Subtract and assign||Assign value to variable after subtracting value on right hand side from previous value of variable||$num-=10 ($num=$num-10)|
|*=||Multiply and assign||Assign value to variable after Multiply value on right hand side with previous value of variable||$num*=10 ($num=$num*10)|
|/=||Divide and assign quotient||Assign value to variable after dividing previous value of variable with value on right hand||$num/=10 ($num=$num/10)|
|%=||Divide and assign modulus||Assign remainder to variable after dividing previous value of variable with value on right hand||$num%=10 ($num=$num%10)|
Increment and Decrements are unary operators means it only works with the single operand. These operators are used to increase or decrease the value of a variable by one. Both Inc and Dec come in two types pre-increment and post-increment.
|++||Increment||Increment the value of $a by one, then return $a|
Return $a, then increment the value of $a by one
Decrement the value of $a by one, then return $a
Return $a, then Decrement the value of $a by one
Logical Operators are used to check logical relation between operands. These operators are used to perform bit level operations.
|and||And||Return TRUE if both $op1 and $op2 are true||$op1 and $op2|
|Or||Or||Return TRUE if either $op1 or $op2 is true||$op1 or $op2|
|xor||Xor||Return TRUE if either $op1 or $op2 is true but not both||$op1 xor $op2|
|!||Not||Return TRUE if $op1 is not true||! $op1|
|&&||And||Return TRUE if either $op1 and $op2 are true||$op1 && $op2|
|||||Or||Return TRUE if either $op1 or $op2 is true||$op1 || $op2|
String operators are used to perform some special operations with Strings.
|.||Concatenation||Concatenate $str1 with $str2||$str1 . $str2|
|.=||Concatenation and Assignment||First will concatenate $str1 with $str2, then assign the final concatenated string to $str1,||$str1 .= $str2|
Array operators are used to perform special operations with Arrays.
|+||Union||Union of $num1 and $num2||$num1 + $num2|
|==||Equality||Return TRUE if $num1 and $num2 have same key/value pair||$num1 == $num2|
|!=||Inequality||Return TRUE if $num1 is not equal to $num2||$num1 != $num2|
|===||Identity||Return TRUE if $num1 and $num2 have same key/value pair of the same type in the same order||$num1 === $num2|
|!==||Non-Identity||Return TRUE if $num1 is not identical to $num2||$num1 !== $num2|
|<>||Inequality||Return TRUE if $num1 is not equal to $num2||$a <> $b|