What is the inequality operator in php and what

The inequality operators in php are "!=", "!==" and "<>". The "!=" and "<>" operators are completely equivalent, without any difference, and are used to compare whether the values ​​​​of two objects are equal; while the "!==" operator indicates absolute inequality. In addition to comparing values, it also Will compare types.

The operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

php inequality operator

Operator	Name	Description	Instance
x != y	is not equal to	If x is not equal to y, return true	5!=8 Return true
x <> y	is not equal to	If x is not equal to y, return true	5<>8 Return true
x !== y	Absolutely not equal	If x is not equal to y, or they are not the same type, return true	5!= ="5" returns true

Instructions: In

php, <> and != These two are completely equivalent, without any difference. They are used to compare whether the values ​​​​of two objects are equal.

is not equal to !== In addition to comparing values, types will also be compared.

For example: 1 != '1' will return false, because the values ​​of number 1 and string 1 are equal,

1 !== '1' will return true because the two types are not equal

Example:

<?php
$x=100; 
$y="100";

var_dump($x == $y); // returns true because values are equal
echo "<br>";
var_dump($x === $y); // returns false because types are not equal
echo "<br>";
var_dump($x != $y); // returns false because values are equal
echo "<br>";
var_dump($x !== $y); // returns true because types are not equal
echo "<br>";

$a=50;
$b=90;

var_dump($a > $b);
echo "<br>";
var_dump($a <  $b);
?>

Output:

bool(true)
bool(false)
bool(false)
bool(true)
bool(false)
bool(true)

Recommended learning: "PHP Video Tutorial"

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