Introduction to the use of operators in PHP development

PHP has a rich set of operators. PHP operators are also often used. PHP operators are distinguished according to different functions. Operators can Divided into: arithmetic operator, string operator, assignment operator, bit operator, conditional operator, and logical operatorwait. Okay, let’s take a look at the PHP operator!

When various operators are in the same expression, their operations have a certain priority.

(1) Arithmetic operation

+ - * / % ++ –

(2) String operator

There is only one string operator. (dot) is the English period. It can concatenate strings to form a new string, or it can concatenate strings with numbers, and the types will be automatically converted.

$a="dawanganban"; 
$b="123"; 
echo $a.$b;   //输出结果：dawanganban123

(3) Assignment operator

= += -= *= /= %= .=

$a="dawanganban"; 
$a.=1; 
$a.=2; 
$a.=3; 
echo $a.$b;   //输出结果：dawanganban123

(4) Bit operator

（5）Comparison operator##> < > ;= <= == != <> === !==

<>: is not equal to sum! =Same

===: Identity, equal values ​​and consistent types

! ==: non-identity, unequal values ​​or inconsistent types

echo 5 == "5"; //true  PHP是弱类型语言（js中的变量类似）
echo 5 === "5";  //false  完全等于

(6) Logical operations

AND (logical AND) OR (logical OR) XOR (logical exclusive OR) && (logical AND) || (logical OR) ! (logical NOT)

var_dump(5 && "");   //false 
var_dump(5 && "2"); //true 
var_dump(5 || ""); //true 
var_dump(0 xor 1); //true 
var_dump(0 xor 0); //false 
var_dump(1 xor 1); //false

The above is all the introduction to the use of operators in PHP development. I hope it will be of great help to the students.

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Simple questions about PHP operator priority

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