Sorting arrays in PHP
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PHP provides several functions for sorting arrays, including sort(), asort(), rsort(), and arsort(). sort() arranges elements in ascending order, asort() maintains index positions during sorting, rsort() sorts in descending order, and arsort() maintains indexes during reverse sorting. These functions allow rearranging array elements alphabetically or numerically into a specified order for easier analysis.
Sorting arrays in PHP
- 1. PHP Tutorials By Vineet Kumar Saini Sorting Arrays in PHP Introduction Sorting is a process by which we can arrange the elements of a list in a specific order i.e. ascending or descending order. We can say sorting is the process of putting a list or a group of items in a specific order. Sorting may be alphabetical or numerical. In PHP, sorting is a process of arranging the elements of an array in a specific order i.e. ascending or descending order. Using sorting you can analyze a list in a more effective way. You can sort an array by value, key or randomly. In the most situations we need to sort an array by value. Some sorting functions are as follows: sort() asort() rsort() arsort() 1. sort() function Using the sort() function you can sort easily and simply. The example of the sort() function is as follows: <html> <body bgcolor="pink"> <h3>Sort() Function</h3> <?php $name=array ("Vineet","Arjun","Manish","Laxman"); echo "<b>Before sorting the values are:</b>".'<br>'; print_r($name).'<br>'.'<br>'; sort($name); echo"<br/>"; echo"<br/>"; echo "<b>After sorting values become:</b>".'<br>'; print_r($name).'<br>'; ?> </body> </html> Output In the above example we defined four elements (names) in the array. In this example we used the sort() function. The sort() function arranges the elements of an array in ascending (alphabetically) order. You can see in the following image:
- 2. PHP Tutorials By Vineet Kumar Saini 2. asort() function In the example above you saw that the elements of the array are arranged in ascending (alphabetically) order. The asort() function sorts an array and also maintains the index position. An example of the asort() function is as follows: <html> <body bgcolor="pink"> <h3>Sort() Function</h3> <?php $name=array ("Vineet","Arjun","Manish","Laxman"); echo "<b>Before sorting the values are:</b>".'<br>'; print_r($name).'<br>'.'<br>'; asort($name); echo"<br/>"; echo"<br/>"; echo "<b>After sorting values become:</b>".'<br>'; print_r($name).'<br>'; ?> </body> </html> Output In this output you will see the array sorted by their index position.
- 3. PHP Tutorials By Vineet Kumar Saini 3. rsort() function The rsort() function is used to sort an array in descending (alphabetic) order. An example of the rsort() function is as follows: <html> <body bgcolor="pink"> <h3>Sort() Function</h3> <?php $name=array ("Vineet","Arjun","Manish","Laxman"); echo "<b>Before sorting the values are:</b>".'<br>'; print_r($name).'<br>'.'<br>'; rsort($name); echo"<br/>"; echo"<br/>"; echo "<b>After sorting values become:</b>".'<br>'; print_r($name).'<br>'; ?> </body> </html> Output In this output you will see the array sorted in a descending (alphabetically) order.
- 4. PHP Tutorials By Vineet Kumar Saini 4. arsort() function The arsort() function is a combination of asort() + rsort(). The arsort() function will sort an array in reverse order and maintain index position. The example of the arsort() function is as follows: <html> <body bgcolor="pink"> <h3>Sort() Function</h3> <?php $name=array ("Vineet","Arjun","Manish","Laxman"); echo "<b>Before sorting the values are:</b>".'<br>'; print_r($name).'<br>'.'<br>'; arsort($name); echo"<br/>"; echo"<br/>"; echo "<b>After sorting values become:</b>".'<br>'; print_r($name).'<br>'; ?> </body> </html> Output
- 5. PHP Tutorials By Vineet Kumar Saini Conclusion In this article you saw how to sort an array in PHP. Using this article one can easily understand sorting an arrays in PHP.