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extract() function in PHP
The extract() function imports variables into the current symbol table from an array. It returns the number of variables successfully extracted.
Syntax
extract(arr, rules, prefix)
Parameters
arr − The specified array
rules − Specifies how to deal with invalid variable name. The following are the 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
prefix − needed only for the following: EXTR_PREFIX_SAME, EXTR_PREFIX_ALL, EXTR_PREFIX_INVALIDor EXTR_PREFIX_IF_EXISTS.
Return
The extract() function returns the number of variables successfully extracted.
Example
The following is an example −
<?php
$prod = array("AM"=>"AMIT", "TM"=>"Tom");
extract($prod);
echo"\$AM is $AM
\$TM is $TM";
?>Output
$AM is AMIT $TM is Tom
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