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The
operator is a symbol used to add or subtract programmatically. It can also be used to compare the size of two values and determine whether they are the same or different. This article will introduce you to the operators in PHP. Instructions.
There are four commonly used operators in php: arithmetic operators, assignment operators, comparison operators, logical operators
Below Let's take a look at the usage of these four operators respectively.
1. Arithmetic operators
The symbols of arithmetic operators are, -, *, /, %
Let’s look at the code Example
Addition:
<?php // 加法 print("加法: 10 + 20 = "); print(10 + 20); // 10 + 20 的结果; print("\n");
Subtraction:
// 减法 print("减法: 100 - 20 = "); print(100 - 20); // 100 - 20 的结果。 print("\n");
Multiplication:
// 乘法 print("乘法: 9 * 5 = "); print(9 * 5); // 9 * 5 的结果。 print("\n");
Division:
// 除法 print("除法: 100 / 10 = "); print(100 / 10); // 100 / 10 的结果。 print("\n");
Remainder:
// 余数 print("余数: 45 % 10 = "); print(45 % 10); // 45 % 10 的余数。 print("\n"); ?>
The result of the operation is:
加法:10 + 20 = 30 减法:100 - 20 = 80 乘法:9 * 5 = 45 除法:100/20 = 5 余数:45%10 = 5
2. Assignment operator
The assignment operator is represented by "=".
变量=数值(或变量)
means assigning "value (or variable)" to "variable"
Let's look at the specific example
The code is as follows
<?php $aisatsu = "php中文网"; print($aisatsu); ?>
Run The results are as follows:
php中文网
The string "php Chinese network" is assigned to $aisatsu.
The result of printing $aisatsu is displayed as "php Chinese website" through the print function. Of course, in addition to strings, values and variables can also be assigned by assignment operators.
3. Comparison operators
Comparison operators are expressed as "==, > =, <=".
Let’s look at a specific example
The code is as follows
<?php $x = 3; if($x == 3) { print('$x等于3'); print("\n"); } if ($x >= 2) { print('$x大于或者等于2'); print("\n"); } if ($x <= 2) { print('$x小于或者等于2'); print("\n"); } ?>
The running result is:
$x等于3 大于或者等于2 $x小于或者等于2
4. Logical operators
Logical operators are expressed as "and, or, &&, ||". "and" and "&&", "or" and "||" respectively have the same meaning.
and" and "&&" represent condition A and condition B; "or" and "||" represent condition A or condition B.
Let's look at specific examples
The code is as follows
<?php $x = 3; if($x >= 1 and $x <= 10){ print('$ x大于或等于1且小于或等于10。'); print("\n"); } if($x >= 4 || $x <= 5 ){ print('$ x大于或等于4或小于或等于5。'); print("\n"); } ?>
The running result is:
$ x大于或等于1且小于或等于10。 $ x大于或等于4或小于或等于5。
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