117 lines
1.9 KiB
Markdown
117 lines
1.9 KiB
Markdown
|
---
|
|||
|
title: Learn About Php Loops
|
|||
|
localeTitle: Узнайте о Php Loops
|
|||
|
---
|
|||
|
Циклы - это блоки кода, которые выполняют определенное количество раз. Использование циклов уменьшает количество строк кода.
|
|||
|
|
|||
|
PHP работает с 4 различными типами циклов:
|
|||
|
|
|||
|
* Пока цикл
|
|||
|
* Делать ... while loop
|
|||
|
* Для цикла
|
|||
|
* Цикл Foreach
|
|||
|
|
|||
|
## Пока цикл
|
|||
|
|
|||
|
В `while` цикл продолжается до тех пор , Выполнение выражений , как заданное условие истинно.
|
|||
|
|
|||
|
\`PHP
|
|||
|
```
|
|||
|
Example:
|
|||
|
```php
|
|||
|
<?php
|
|||
|
$x = 1;
|
|||
|
while($x <= 3)
|
|||
|
{
|
|||
|
echo "x=$x ";
|
|||
|
$x++;
|
|||
|
}
|
|||
|
?>
|
|||
|
```
|
|||
|
```
|
|||
|
Output:
|
|||
|
x=1 x=2 x=3
|
|||
|
```
|
|||
|
|
|||
|
## Do...while loop
|
|||
|
|
|||
|
In the `do...while` loop the block of code is executed before the condition is checked.
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
do {
|
|||
|
execute code;
|
|||
|
} while (condition);
|
|||
|
?>
|
|||
|
```
|
|||
|
Example:
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
$x= 1;
|
|||
|
do {
|
|||
|
echo "x=$x ";
|
|||
|
$x++;
|
|||
|
} while ($x < 5);
|
|||
|
?>
|
|||
|
```
|
|||
|
```
|
|||
|
Output:
|
|||
|
x=1 x=2 x=3 x=4
|
|||
|
```
|
|||
|
|
|||
|
## For loop
|
|||
|
|
|||
|
The `for` loop is used when the number of times the block is to be executed is known in advance.
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
for (variable initialisation; test condition; increment)
|
|||
|
{
|
|||
|
execute code;
|
|||
|
}
|
|||
|
?>
|
|||
|
```
|
|||
|
Example:
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
for ($x=1 ; $x <= 4 ; $x++)
|
|||
|
{
|
|||
|
echo "x= $x ";
|
|||
|
}
|
|||
|
?>
|
|||
|
```
|
|||
|
```
|
|||
|
Output:
|
|||
|
x=1 x=2 x=3 x=4
|
|||
|
```
|
|||
|
|
|||
|
## Foreach loop
|
|||
|
|
|||
|
The `foreach` loop helps in traversing through arrays.
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
foreach ($array as $value)
|
|||
|
{
|
|||
|
executable code;
|
|||
|
}
|
|||
|
?>
|
|||
|
```
|
|||
|
Example:
|
|||
|
|
|||
|
```php
|
|||
|
<?php
|
|||
|
$numbers= array("One", "Two", "Three");
|
|||
|
foreach ($numbers as $value)
|
|||
|
{
|
|||
|
echo "$value ";
|
|||
|
}
|
|||
|
?>
|
|||
|
```
|
|||
|
```
|
|||
|
Output:
|
|||
|
One Two Three
|
|||
|
|
|||
|
```
|