Mastering the while Loop in PHP: A Complete Guide

 The for loop repeats a segment of code a specific number of times, while the while loop repeats a segment of code an unknown number of times. The while loop works differently than the for loop.

Syntax:

<span class="pln">

</span><span class="kwd">while</span><span class="pun">(</span><span class="pln">condition</span><span class="pun">){</span><span class="pln">
  </span><span class="com">// execute this code;</span><span class="pln">
  </span><span class="com">// your code here</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span>

Example of while loop

<span class="pln">

</span><span class="pun">&lt;?</span><span class="pln">php
$num </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">while</span><span class="pun">(</span><span class="pln">$num </span><span class="pun">&lt;</span><span class="pln"> </span><span class="lit">25</span><span class="pun">){</span><span class="pln">
    $num </span><span class="pun">=</span><span class="pln"> $num </span><span class="pun">+</span><span class="pln"> </span><span class="lit">5</span><span class="pun">;</span><span class="pln">
    </span><span class="kwd">print</span><span class="pln"> $num </span><span class="pun">.</span><span class="pln"> </span><span class="str">"&lt;br /&gt;"</span><span class="pun">;</span><span class="pln">	
</span><span class="pun">}</span><span class="pln">
</span><span class="pun">?&gt;</span><span class="pln">

</span>

Output:

The above code will produce the following result-

<span class="pln">

</span><span class="lit">5</span><span class="pln">
</span><span class="lit">10</span><span class="pln">
</span><span class="lit">15</span><span class="pln">
</span><span class="lit">20</span><span class="pln">
</span><span class="lit">25</span><span class="pln">

</span>

In the above code, a variable named num is initialized with the value of 0. The condition in the while loop is that while num is less than 25, 5 should be added to num. Once the value of num is greater than 25, the loop will stop executing.