What does the php special symbol <> mean?

PHP is a very popular programming language, and its syntax and keywords are relatively simple and easy to understand. However, for beginners, it may be difficult to understand some special symbols. One of the common special symbols is <>.

<> is actually an HTML escape symbol, used to escape some special characters in HTML into ordinary characters to avoid conflict with tags and attributes of HTML code. In PHP, the <> symbol is usually used in comparison operators to represent "less than" and "greater than" symbols.

For example, to compare the size of two numbers, you can use the following code:

$a = 15;
$b = 10;

if ($a > $b) {
    echo "a大于b";
} elseif ($a < $b) {
    echo "a小于b";
} else {
    echo "a等于b";
}

In this code, the > symbol represents "greater than" and the < symbol represents "less than". Use To determine the size relationship between $a and $b.

It should be noted that the <> symbol is different from the common greater than or equal to and less than or equal to symbols. It only represents strict greater than and less than. If you need to judge the equality situation in the size relationship, you should use the corresponding operators "==" and "!=".

In addition, in some cases, the <> symbol can also mean not equal. For example:

$a = 15;
$b = 10;

if ($a <> $b) {
    echo "a不等于b";
} else {
    echo "a等于b";
}

In this code, the <> symbol represents "not equal to" and is used to determine whether $a and $b are equal.

In general, the <> symbol has a clear meaning in PHP. It is mainly used in comparison operators to represent "less than" and "greater than". Sometimes it can also represent not equal to mean. For beginners, familiarity with the use of these special symbols will help improve the efficiency and accuracy of writing code.

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