﻿ PHP Exercise: Swap two variables - w3resource

# PHP Exercises : Swap two variables

## PHP : Exercise-31 with Solution

Write a PHP program to swap two variables.

PHP: Swapping two variables

Swapping two variables refers to mutually exchanging the values of the variables. Generally, this is done with the data in memory.

The simplest method to swap two variables is to use a third temporary variable :

```define swap(a, b)
temp := a
a := b
b := temp
```

Sample Solution: -

Code : Swap two numbers using a third variable

PHP Code:

``````<?php
\$a = 15;
\$b = 27;

// Swap Logic

echo "\nThe number before swapping is:\n";
echo "Number a =".\$a." and b=".\$b;

\$temp = \$a;
\$a = \$b;
\$b = \$temp;

echo "\nThe number after swapping is: \n";
echo "Number a =".\$a." and b=".\$b."\n";
?>
```
```

Code: Swap two variables value without using third variable

``````<?php
\$a = 15;
\$b = 276;
echo "\nBefore swapping:  ". \$a . ',' . \$b;
list(\$a, \$b) = array(\$b, \$a);
echo "\nAfter swapping:  ". \$a . ',' . \$b."\n";
?>
```
```

Sample Output:

```The number before swapping is:
Number a =15 and b=27
The number after swapping is:
Number a =27 and b=15
```

Flowchart:

PHP Code Editor:

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## PHP: Tips of the Day

Returns all elements in an array except for the first one

Example:

```<?php
function tips_tail(\$items)
{
return count(\$items) > 1 ? array_slice(\$items, 1) : \$items;
}

print_r(tips_tail([1, 5, 7]));
?>
```

Output:

```Array
(
[0] => 5
[1] => 7
)
```