php! 연산자
$a == $b Equal TRUE if $a is equal to $b after type juggling.
$a === $b Identical TRUE if $a is equal to $b, and they are of the same type.
$a != $b Not equal TRUE if $a is not equal to $b after type juggling.
$a <> $b Not equal TRUE if $a is not equal to $b after type juggling.
$a !== $b Not identical TRUE if $a is not equal to $b, or they are not of the same type.
$a < $b Less than TRUE if $a is strictly less than $b.
$a > $b Greater than TRUE if $a is strictly greater than $b.
$a <= $b Less than or equal to TRUE if $a is less than or equal to $b.
$a >= $b Greater than or equal to TRUE if $a is greater than or equal to $b.
$a <=> $b Spaceship An integer less than, equal to, or greater than zero when $a is less than, equal to, or greater than $b, respectively. Available as of PHP 7.
php 에서 문자열 비교
//In php to compare two string we can use strcmp() function
Syntax
strcmp(string1,string2);
//If both string is same then it will return 0
<?php
echo strcmp("Hello world!","Hello world!");
?>
php 비교 문자열
<?php
$var1 = "Hello";
$var2 = "hello";
if (strcmp($var1, $var2) !== 0) {
echo '$var1 is not equal to $var2 in a case sensitive string comparison';
}
?>
숫자보다 작은 경우 php
<?php
if ($a > $b)
echo "a is bigger than b";
?>