What are the ways to use php symbols?

How to use PHP symbols and types: 1. Variable symbol, use echo statement to output it to the Web page; 2. Array symbol, you can use array index to access data; 3. Function symbol, after the function name Following the parentheses is equivalent to executing the function; 4. Operation symbols, PHP supports various operators; 5. Control structure symbols, including if/else, switch and loop structures, etc.; 6. Comment symbols, you can use double slashes ( //) to add a single line comment.

The operating environment of this tutorial: windows10 system, php8.1.3 version, DELL G3 computer.

PHP is a very popular programming language and for many developers, it is one of the first choices for building dynamic websites and web applications. In PHP, symbols are the basis of the language and can help you implement complex functions. To this end, this article will introduce you to the use of symbols in PHP.

Variable symbol

You need to use the $ symbol before the variable name in PHP, as shown below:

$variableName = 
'Hello 
World!';
echo $variableName;

Through the above code, we can convert the string into 'Hello World!' is stored in the $variableName variable and is output to the web page using an echo statement.

Array notation

In PHP, square brackets ([]) represent arrays. The following is an example of creating an array:

$fruits = 
['apple', 
'banana', 
'orange'];

We can use array index to access data:

echo $fruits[0]; 
//输出'apple'

Function notation

In PHP, functions The name followed by parentheses is equivalent to executing the function, as shown below:

echo strlen('Hello 
World!');

The output result of the above code is: 11, which is the number of characters in the string 'Hello World!'.

Operation symbols

supports various operators in PHP, such as arithmetic operators, logical operators, comparison operators, etc. The following is an example:

$x = 
10;
$y = 
5;
echo $x + 
$y; 
//输出15
echo $x - 
$y; 
//输出5
echo $x * 
$y; 
//输出50
echo $x / 
$y; 
//输出2
echo $x % 
$y; 
//输出0
echo $x > 
$y; 
//输出1
echo $x < 
$y; 
//输出0

Control structure symbols

Control structure symbols in PHP include if/else, switch and loop structures, etc. The following is an example of using if/else statements:

$x = 
10;
$y = 
5;
if ($x > 
$y) 
{
    echo 'x 
is greater than y';
} 
else {
    echo 'y 
is greater than x';
}

The output result is: 'x is greater than y', because the value of $x is greater than $y.

Comment symbols

In PHP, you can use double slashes (//) to add single-line comments. An example is as follows:

//这是一个单行注释

If you need to add a multi-line comment, you can use slash asterisks (/ /) to surround your comment. Examples are as follows:

/*
这是一个
多行注释
*/

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