Application skills of commonly used symbols in PHP

As a popular server-side scripting language, PHP is widely used in web development. In PHP programming, it is very important to be proficient in the application skills of commonly used symbols. This article will introduce some application techniques of commonly used symbols in PHP, and use specific code examples to help readers better understand their usage.

1. Double quotes and single quotes

In PHP, both double quotes and single quotes can be used to represent strings, but they have different characteristics. Double quotes can parse variables and escape characters, while single quotes are output unchanged. Here is an example:

$name = "Alice";
echo "Hello, $name"; // Output Hello, Alice
echo 'Hello, $name'; // Output Hello, $name

2. Operator

Commonly used operators in PHP include arithmetic operators, assignment operators, comparison operators, etc. . Among them, == and === are the more commonly used comparison operators. == is used to determine whether the values ​​of two variables are equal, while === not only determines whether the values ​​are equal, but also requires the same type. Example:

$num1 = 10;
$num2 = "10";

if($num1 == $num2) {
    echo "Equal";
} else {
    echo "not equal";
}

if($num1 === $num2) {
    echo "congruent";
} else {
    echo "not congruent";
}

3. Array

Array is a very important data type in PHP. Commonly used symbols include [] for creating arrays, $ arr[] is used to add elements to the array, and foreach is used to traverse the array. Example:

$fruits = array("apple", "banana", "orange");

$fruits[] = "grape";

foreach($fruits as $fruit) {
    echo $fruit . "<br>";
}

4. Arrow operator

Arrow operator-> is used to access the properties and methods of the object. Example:

class Person {
    public $name = "Alice";
    
    public function sayHello() {
        echo "Hello, my name is " . $this->name;
    }
}

$person = new Person();
echo $person->name; // Output Alice
$person->sayHello(); // Output Hello, my name is Alice

5. The percent sign

percent sign% is used to retrieve Modulo arithmetic is to find the remainder of dividing a number by another number. Example:

$num = 10;
$remainder = $num % 3;
echo $remainder; // Output 1

The above are the application skills of common symbols in PHP and the corresponding code examples. I hope this article can help readers gain a deeper understanding of the usage of these symbols and thereby improve their skills in PHP programming. Let us study hard together and make continuous progress!

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