The following loop statements are provided in PHP: while: Repeat the code block when the condition is true. do-while: Execute the code block first, then check whether the condition is true, and continue executing the loop if it is true. for: Initialize the variable, check the condition, execute the code block, and then increment the variable. foreach (array): Loops through the elements in the array and provides the key and value. foreach (object): Loops through the properties in the object and provides property names and values.
Loop statements in PHP
PHP provides a variety of loop statements that are used to perform loop statements when certain conditions are met. block of code is executed repeatedly. These loop statements include:
while loop
- Syntax:
while (condition)
- Repeatedly execute the code block , as long as the condition is true.
do-while loop
- Syntax:
do {...} while (condition);
- Execute the code block first, then check whether the condition is true, and if it is true, continue to execute the loop.
for loop
- Syntax:
for (initialization; condition; increment)
- Initialize variables , checks the condition, executes the code block, and then increments the variable.
foreach loop
- Syntax:
foreach ($array as $key => $value)
- Loop through the elements in the array, providing keys and values as needed.
foreach loop (object)
- Syntax:
foreach ($object as $property => $value)
- Loop through the properties in the object and provide property names and values as needed.
break statement
- is used to exit immediately from the loop.
continue statement
- is used to skip the current iteration of the loop and continue executing the next iteration.
Example:
// while 循环 $i = 0; while ($i < 10) { echo $i . "\n"; $i++; } // for 循环 for ($i = 0; $i < 10; $i++) { echo $i . "\n"; } // foreach 循环(数组) $array = ['foo', 'bar', 'baz']; foreach ($array as $item) { echo $item . "\n"; }
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