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Both are comparison operators used to compare two or more values. == Operator: This operator is used to check the given values are equal or not. If yes, it returns true, otherwise it returns false. === Operator: This operator is used to check the given values and its data type are equal or not.
The difference between == and === is that: == converts the variable values to the same type before performing comparison. This is called type coercion. === does not do any type conversion (coercion) and returns true only if both values and types are identical for the two variables being compared.
The main difference between the == and === operator in javascript is that the == operator does the type conversion of the operands before comparison, whereas the === operator compares the values as well as the data types of the operands.
single quote is generally faster, and everything quoted inside treated as plain string, like echo 'anyting else ? $ something'; >> anything else? $ something. PHP won't use additional processing to interpret what is inside the single quote.
Because the equality operator == coerces, or converts, the data type temporarily to see if it’s equal to the other operand, whereas === (the identity operator) doesn’t need to do any converting whatsoever and thus less work is done, which makes it faster.
=== does not perform typecasting, so 0 == '0' evaluates to true, but 0 === '0' - to false.
There are two things to consider:
If operand types are different then == and === produce different results. In that case the speed of the operators does not matter; what matters is which one produces the desired result.
If operand types are same then you can use either == or === as both will produce same results. In that case the speed of both operators is almost identical. This is because no type conversion is performed by either operators.
I compared the speed of:
$a == $b vs $a === $b
$a and $b were random integers [1, 100]And here are the results:
$a == $b $a === $b
--------- ---------
0.765770 0.762020
0.753041 0.825965
0.770631 0.783696
0.787824 0.781129
0.757506 0.796142
0.773537 0.796734
0.768171 0.767894
0.747850 0.777244
0.836462 0.826406
0.759361 0.773971
--------- ---------
0.772015 0.789120
You can see that the speed is almost identical.
First, === checks to see if the two arguments are the same type - so the number 1 and the string '1' fails on the type check before any comparisons are actually carried out. On the other hand, == doesn't check the type first and goes ahead and converts both arguments to the same type and then does the comparison.
Therefore, === is quicker at checking a fail condition
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