We now have a youtube channel. Subscribe!

PHP extract() Function

PHP extract() Function

Hello folks! welcome back to a new edition of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP extract() Function.

The built-in PHP extract() function is used for importing variables from an array into the current symbol table.

It takes an associative array and treat keys as variable names and values as variable values. For each key/value pair it creates a variable in the current symbol table, subject to extract_type and prefix parameters.


Following below is the syntax to use this function -

extract($array, $extract_type, $prefix)

Parameter Details

Sr.NoParameter & Description


It specifies an array



. The extract() function checks for invalid variable names and collisions with existing variable names. This parameter specifies how invalid and colliding names are treated.Possible values −

  • EXTR_OVERWRITE − Default. On collision, the existing variable is overwritten

  • EXTR_SKIP − On collision, the existing variable is not overwritten

  • EXTR_PREFIX_SAME − On collision, the variable name will be given a prefix

  • EXTR_PREFIX_ALL − All variable names will be given a prefix

  • EXTR_PREFIX_INVALID − Only invalid or numeric variable names will be given a prefix

  • EXTR_IF_EXISTS − Only overwrite existing variables in the current symbol table, otherwise do nothing

  • EXTR_PREFIX_IF_EXISTS − Only add prefix to variables if the same variable exists in the current symbol table

  • EXTR_REFS − Extracts variables as references. The imported variables are still referencing the values of the array parameter



If EXTR_PREFIX_SAME, EXTR_PREFIX_ALL, EXTR_PREFIX_INVALID or EXTR_PREFIX_IF_EXISTS are used in the extract_rules parameter, a specified prefix is required.

This parameter specifies the prefix. The prefix is automatically separated from the array key by an underscore character.

Return Value

This PHP function returns back the number of variables successfully imported into the symbol table.


Try out the below example -

   $size = "large";
   $input = array("color" => "blue", "size"  => "medium", "shape" => "sphere");
   extract($input, EXTR_PREFIX_SAME, "bbcx");
   echo "$color, $size, $shape, $bbcx_size";


When the above code is executed, it will produce the following result -

blue, large, sphere, medium

Alright guys! This is where we are going to be rounding up for this tutorial post. In our next tutorial, we are going to be discussing about the PHP in_array() Function.

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

Follow us on our various social media platforms to stay updated with our latest tutorials. You can also subscribe to our newsletter in order to get our tutorials delivered directly to your emails.

Thanks for reading and bye for now.

Post a Comment

Hello dear readers! Please kindly try your best to make sure your comments comply with our comment policy guidelines. You can visit our comment policy page to view these guidelines which are clearly stated. Thank you.
© 2023 ‧ WebDesignTutorialz. All rights reserved. Developed by Jago Desain