## The 3 different equals

php greater than or equal to not working

approximately equal sign

compare two values in php

php

php compare integers

echo <=>

php

What is the difference between `=`

, `==`

, and `===`

?

I think using one equal sign is to declare a variable while two equal signs are for a comparison condition and lastly three equal signs are for comparing values of declared variables.

You have `=`

the **assignment operator**, `==`

the **'equal' comparison operator** and `===`

the **'identical' comparison operator**.

$a = $b Assign Sets $a to be equal to $b. $a == $b Equal TRUE if $a is equal to $b. $a === $b Identical TRUE if $a is equal to $b, and they are of the same type. (introduced in PHP 4)

For more info on the need for `==`

and `===`

, and situations to use each, look at the docs.

**What 3 equal signs and not two?,** Here's the meaning of the different equals sign operators: x = y assign to x the value of y. x == y compare and return true if and only if the two have the same THE EQUALS THREE SHOW - with Carlos Santos Ray William Johnson; 336 videos; 157,606,380 views; Last updated on Feb 1, 2020

**The 3 different equals,** The 3 different equals. variable while two equal signs is for a comparison condition and lastly three equal signs is for comparing values of declared variables. Equals 3 Business challenge. To develop a new enterprise solution for analyzing marketing data, Transformation. The business launched its innovative Lucy platform in an IBM Cloud environment, Results. Business challenge story. Today’s marketing organizations are awash in data,

= assignment operator

== checks if two variables have the same value

=== checks if two variables have the same value AND if their types are the same

**Equals sign,** 3 Other uses. 3.1 Spelling. 3.1.1 Tone letter; 3.1.2 Personal names. 3.2 Linguistics; 3.3 Chemistry; 3.4 LGBT symbol. 4 Related symbols. 4.1 Approximately equal Ray William Johnson (born August 14, 1981) is an American actor, comedian, film producer, film director, screenwriter, and rapper, who is known for his YouTube channel, Ray William Johnson, and his web series on that channel, Equals Three. As of March 2019, the channel had earned more than three billion views

The = operator assigns the value to a variable $six = 6; value 6 is assigned to variable $six

== operator check if the value of both variables is equal and mostly used in conditions like if statements

$a = 2; $b = 2; if ($a == $b) { echo both variables have the same value; }

=== operator similar to == (check if the value equals) and also check if both of same data type

$a = 2; $b = "2"; if ($a === $b) { echo "both variable have same value and of same data type"; } else { echo 'both variable is either not equal or not of same data type'; }

// here $a is of type int whereas $b is of type string. So here the output

**Equality (mathematics),** In mathematics, equality is a relationship between two quantities or, more generally two mathematical expressions, asserting that the quantities have the same value, or that the expressions represent the same mathematical object. The equality between A and B is written A = B, and pronounced A equals B. The binary relation "is approximately equal" between real numbers or What is the difference between =, ==, and ===?. I think using one equal sign is to declare a variable while two equal signs are for a comparison condition and lastly three equal signs are for comparing values of declared variables.

For advanced PHP users, knowing the difference between `==`

and `===`

and asking themselves "is it faster to compare with `==`

or with `===`

when I'm sure that both the operands are the same type?"

The short and general answer is: **There is no performance gain in using === in this cases, so you should probably use ==.**

For the ones interested in benchmarking it themselves, you can use the following code I wrote ad-hoc and try different values for `$a`

and `$b`

:

<?php // CONFIGURATION $cycles = 1000000; $a = 'random string 1'; $b = 'random string 2'; // FUNCTIONS function compare_two_equals($a, $b) { if ($a == $b) { return TRUE; } else { return FALSE; } } function compare_three_equals($a, $b) { if ($a === $b) { return TRUE; } else { return FALSE; } } // EXECUTION $time = microtime(TRUE); for ($count_a = 0; $count_a < $cycles; $count_a++) { compare_two_equals($a, $b); } $time_two_a = microtime(TRUE) - $time; $time = microtime(TRUE); for ($count_a = 0; $count_a < $cycles; $count_a++) { compare_three_equals($a, $b); } $time_three_a = microtime(TRUE) - $time; $time = microtime(TRUE); for ($count_a = 0; $count_a < $cycles; $count_a++) { compare_two_equals($a, $b); } $time_two_b = microtime(TRUE) - $time; $time = microtime(TRUE); for ($count_a = 0; $count_a < $cycles; $count_a++) { compare_three_equals($a, $b); } $time_three_b = microtime(TRUE) - $time; $time = microtime(TRUE); // RESULTS PRINTING print "<br />\nCOMPARE == (FIRST TRY): " . number_format($time_two_a, 3) . " seconds"; print "<br />\nCOMPARE == (SECOND TRY): " . number_format($time_two_b, 3) . " seconds"; print "<br />\nCOMPARE === (FIRST TRY): " . number_format($time_three_a, 3) . " seconds"; print "<br />\nCOMPARE === (SECOND TRY): " . number_format($time_three_b, 3) . " seconds"; ?>

NOTE: The comparison is valid only when each "FIRST TRY" is very close to its "SECOND TRY". If they are significantly different, it means that the processor was busy doing something else while executing the comparisons and so the results are unreliable and the benchmark should be run again.

**Equal -- from Wolfram MathWorld,** A symbol with three horizontal line segments ( = ) resembling the equals sign is used to denote both equality by definition (e.g., A=B means A is defined to be 7^3 = 343. The factors of 343 are: 1, 7, 49, 343. If one of the numbers is 343, the others would have to be both 1, but the three integers are all different, so that doesn't work. So the three integers must be 1, 7, and 49. So their sum is: 1 + 7 + 49 = 57

**JavaScript,** Learn equality in JavaScript in 3 minutes. Brandon Morelli 77 does not strictly equal '77' because they have different types. However, if we The United States has three branches of government: the executive, the legislative and the judicial. Each of these branches has a distinct and essential role in the function of the government, and they were established in Articles 1 (legislative), 2 (executive) and 3 (judicial) of the U.S. Constitution.

**JavaScript Showdown: == vs ===,** With double equals, JavaScript attempts to convert the values into a common type. In this example, JavaScript converts the string value of '3' into a number, then First, an exponent states how many times a number is multiplied by itself, such as 3^2, or 3 "squared", meaning that the result is 3x3. With this in mind, look back at 4x4. Since the number multiplied is the same, we can write it using exponents.

**Equal, Less and Greater Than Symbols,** we use the "not equal to" sign. example: 2+2 ≠ 9. <. When one value is smaller than another we use a "less than" sign. example: 3 < 5. > When one value is Question 229063: what are three positive integers whose sum equals their product?1,2,3 1+2=3+3=6 But I'm going to start by using different expressions.

##### Comments

- check out the example ... I have posted it would clarify more things ..
- For advanced PHP users, knowing the difference between == and === and asking themself "is it faster to compare with == or with === when I'm sure that both the operands are the same type?", please look at my benchmark script below.
- @Strawberry I feel the question's tag should also include the javascript tag since it also applies to that language.
- (Update): I have added the javascript tag in an edit, since there have been quite a few questions where people were using
`=`

in javascript. That doesn't only apply to PHP but other languages also. - I went ahead and deleted the JavaScript tag: all answers here are only about PHP (except the latest which is very weak), there
*are*differences between how the languages handle it, and there is already a similar de facto canonical JavaScript question (Which equals operator (== vs ===) should be used in JavaScript comparisons?). - when I compare two identical datetime, I have false result, why ? example : sandbox.onlinephpfunctions.com/code/…
- @stloc,
`===`

with objects tells you if they are the same object, not if they have the same content. - Introduced in PHP4, funny in Y2018 ;-)
- Also know about != and !== 'not' versions of the two comparison operators. Some languages use := as assignment, just to avoid this kind of confusion.
- Microbenchmarks like this are not very reliable. It is also highly unlikely that you'd ever want to worry about
`==`

or`===`

as the cause of your performance problem. IMO: It's better to be strict (`===`

) unless you explicitly want to be loose (`==`

) about your comparisons. The number of strange edge cases i.e.`"5 is not a number" == 5`

can lead to wacky bugs.`===`

never suffers from this problem. - My test was to tell programmers that if they're choosing
`===`

for performance reasons, they're wrong. So programmers are free to choose`===`

or`==`

based on logical reasons but not on performance reasons: there are different cases to prefer the one or the other and performance must not be taken into account at all.