matlab 运算子图

Today we will look into PHP operators. Earlier we went through PHP tutorial for beginners to get you started with variables and String.

今天，我们将研究PHP运算符。 之前，我们为初学者提供了PHP教程，以帮助您开始使用变量和String。

PHP运算子 (PHP Operators)

We can use PHP operators with String, integers, boolean and arrays.

我们可以将PHP运算符与String，integer，boolean和arrays一起使用。

PHP运算符类型 (PHP Operator Types)

PHP scripting language provides different kinds of operators to work with variables such as arithmetic operators, comparison and logical operators.

PHP脚本语言提供了各种运算符来使用变量，例如算术运算符，比较运算符和逻辑运算符。

1. PHP算术运算符 (1. PHP Arithmetic Operators)

<?php$a = 10;
$b = 5;
$c = 3;
$d = 8;//addition example
$add=$a + $b;
echo $add; //prints 15
echo "<br>";//subtraction example
$sub = $a - $b;
echo $sub; //prints 5
echo "<br>";//multiplication example
$mul = $a * $b;
echo $mul; //prints 50
echo "<br>";//division example
$div = $a / $b;
echo $div; // prints 2
echo "<br>";
echo $a/$c; //prints 3.3333333333333
echo "<br>";
echo $d/$c; //prints 2.6666666666667
echo "<br>";//modulus example
$mod= $a % $b;
echo $mod;
echo "<br>"; //prints 0//Negation example
$neg = -$a;
echo $neg; //prints -10;
echo "<br>";//Concatenation example
$str1="Pankaj";
$str2="Kumar";echo $str1 . " " . $str2; //prints "Pankaj Kumar"
echo "<br>";echo $a . $b; //prints 105
echo "<br>";echo $c . $d; //prints 38
?>

2. PHP赋值运算符 (2. PHP Assignment Operators)

<?php$a=12;//assignment operator example
$b=$a;
echo $b; //prints 12
echo "<br>";$a+=$b;
echo $a; //prints 24, same as a=a+b
echo "<br>";$a-=$b;
echo $a; //prints 12, same as a=a-b=24-12
echo "<br>";$a*=$b;
echo $a; //prints 144, same as a=a*b=12*12
echo "<br>";$a/=$b;
echo $a; //prints 12, same as a=a/b=144/12
echo "<br>";$a%=$b;
echo $a; //prints 0, same as a=a%b=12%12
echo "<br>";$a.=$b;
echo $a; //prints 012, same as a=a.b=0.12=012?>

3. PHP增/减运算符 (3. PHP Increment/Decrement Operators)

<?php$a=12;//Pre-increment example
$b=++$a;
echo "a=".$a." ,b=".$b; //prints a=13 ,b=13
echo "<br>";//Post-increment example
$b=$a++;
echo "a=".$a." ,b=".$b; //prints a=14 ,b=13
echo "<br>";//Pre-decrement example
$b=--$a;
echo "a=".$a." ,b=".$b; //prints a=13 ,b=13
echo "<br>";//Post-decrement example
$b=$a--;
echo "a=".$a." ,b=".$b; //prints a=12 ,b=13
echo "<br>";?>

4. PHP比较运算符 (4. PHP Comparison Operators)

<?php$a=10;
$b="10";
$c=10;
$d=5;//Equal example
var_dump($a==$b); //prints bool(true)
echo "<br>";
var_dump($a==$c); //prints bool(true)
echo "<br>";//Identical example
var_dump($a===$b); //prints bool(false)
echo "<br>";
var_dump($a===$c); //prints bool(true)
echo "<br>";//Not equal example
var_dump($a!=$b); //prints bool(false)
echo "<br>";
var_dump($a!=$c); //prints bool(false)
echo "<br>";
var_dump($a<>$b); //prints bool(false)
echo "<br>";
var_dump($a<>$c); //prints bool(false)
echo "<br>";//Not identical example
var_dump($a!==$b); //prints bool(true)
echo "<br>";
var_dump($a!==$c); //prints bool(false)
echo "<br>";//Less than example
var_dump($a<$b); //prints bool(false)
echo "<br>";
var_dump($a<$d); //prints bool(false)
echo "<br>";//Greater than example
var_dump($a>$b); //prints bool(false)
echo "<br>";
var_dump($a>$d); //prints bool(true)
echo "<br>";//Less than or equal to example
var_dump($a<=$b); //prints bool(true)
echo "<br>";
var_dump($a<=$d); //prints bool(false)
echo "<br>";//Greater than or equal to example
var_dump($a>=$b); //prints bool(true)
echo "<br>";
var_dump($a>=$d); //prints bool(true)
echo "<br>";?>

5. PHP逻辑运算符 (5. PHP Logical Operators)

<?php$a=true;
$b=false;
$c=true;//And example
var_dump($a and $b); //prints bool(false)
var_dump($a and $c); //prints bool(true)var_dump($a && $b); //prints bool(false)
var_dump($a && $c); //prints bool(true)echo "<br>";//Or example
var_dump($a or $b); //prints bool(true)
var_dump($a or $c); //prints bool(true) var_dump($a || $b); //prints bool(true)
var_dump($a || $c); //prints bool(true)
echo "<br>";//Xor example
var_dump($a xor $b); //prints bool(true)
var_dump($a xor $c); //prints bool(false)
echo "<br>";//Not example
var_dump(!$a); //prints bool(false)
var_dump(!$b); //prints bool(true)
echo "<br>";?>

6. PHP按位运算符 (6. PHP Bitwise Operators)

<?php$a=15; // 00001111
$b=35; // 00100011//Bitwise And example
$c=$a & $b;
//  00001111
// &00100011
//  00000011echo $c; //prints 3
echo "<br>";//Bitwise Or example
$c=$a | $b;
//  00001111
// |00100011
//  00101111echo $c; //prints 47
echo "<br>";//Bitwise Xor example
$c=$a ^ $b;
//  00001111
// ^00100011
//  00101100echo $c; //prints 44
echo "<br>";//Bitwise Not example
$c=$a & ~$b; //bits that are set in a but not in b, 00001100 = 12
$d=$b & ~$a; //bits that are set in b but not in a, 00100000 = 32echo $c; //prints 12
echo "<br>";
echo $d; //prints 32
echo "<br>";//Shift left example
$c=$a<<2; //bits shifted to left two places, 00111100 = 60
echo $c; //prints 60
echo "<br>";//Shift right example
$c=$a>>2; //bits shifted to right two places, 00000011 = 3
echo $c; //prints 3?>

7. PHP数组运算符 (7. PHP Array Operators)

<?php$cars=array("BMW","Toyota","Honda");
$buses=array("BMW","Volvo","Tata","Mercedez");//Union of Arrays
$cars_buses = $cars + $buses;
$arrlength=count($cars_buses);for($x=0;$x<$arrlength;$x++){echo $cars_buses[$x] . " "; //prints "BMW Toyota Honda Mercedez "}
echo "<br>";//Arrays Equality
$cars1=array("BMW","2" => "Honda",1 => "Toyota");
var_dump($cars == $cars1); //prints bool(true);
var_dump($cars == $buses); //prints bool(false);
echo "<br>";//Identical Arrays operator
var_dump($cars === $cars1); //prints bool(false);
var_dump($cars === $buses); //prints bool(false);
echo "<br>";//Inequality example
var_dump($cars != $cars1); //prints bool(false);
var_dump($cars != $buses); //prints bool(true);
echo "<br>";var_dump($cars <> $cars1); //prints bool(false);
var_dump($cars <> $buses); //prints bool(true);
echo "<br>";//Non-Identical Arrays operator
var_dump($cars !== $cars1); //prints bool(true);
var_dump($cars !== $buses); //prints bool(true);
echo "<br>";?>

8. PHP类型运算符 (8. PHP Type Operator)

instanceof is the type operator used to determine if a PHP variable is an instantiated object of a class or not.

instanceof是用于确定PHP变量是否为类的实例化对象的类型运算符。

<?php
class MyClass{}class OtherClass{}$var = new MyClass;var_dump($var instanceof MyClass); // prints bool(true)
var_dump($var instanceof OtherClass); // prints bool(false)?>

That’s all for PHP operators. In the next tutorial, we will learn about PHP Conditional Statements, Arrays and Loops in PHP.

PHP运算符就这些了。 在下一个教程中，我们将学习PHP中PHP条件语句，数组和循环。

翻译自: https://www.journaldev.com/1477/php-operators

matlab 运算子图