What are the uses of expressions in php?

Expression is the most important cornerstone of PHP. In PHP, almost everything you write is an expression. The simple but most precise way to define an expression is "anything with a value". This article mainly introduces relevant information about expressions in PHP. Friends who need it can refer to

Expression is an important concept in PHP. Expressions can be understood as "anything with value" thing". In this tutorial, when it comes to the syntax of expressions, we use "expr" to represent expressions.

The following is an expression:

$x > $y;

In the above example, when the value of $x is greater than $y, the expression value is TRUE, otherwise it is FALSE.

We often determine our next step logic by judging the value of an expression (including specific numerical values ​​and Boolean values), such as the following example:

<?php
if ($x > $y) {
echo "x > y";
}
?>

This example uses if logical judgment , the judgment condition is the $x > $y expression in parentheses. If $x > $y is true (TRUE), then the words "y > x" will be output. Of course, the actual situation is much more complicated.

Expressions widely exist in our PHP programming.

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