Extract of PHP array processing function and instance code _php example

PHP Array handler function extract

The extract function is used to import a variable from an array into the current symbol table

Basic syntax

int Extract (array & $var _array [, int $extract _type = extr_overwrite [, String $prefix = NULL]])

This function is used to import a variable from an array into the current symbol table. Check each key name to see if it can be used as a valid variable name and also check for conflicts with variable names already in the symbol table.

Parameter introduction:

Parameters	Description
Var_array	Necessary. Specify the array to use. An associative array. This function takes the key name as the variable name and the value as the value of the variable. For each key/value pair, variables are established in the current symbol table and are affected by Extract_type and prefix parameters. An associative array must be used, and an array of numeric indices will not produce results unless extr_prefix_all or extr_prefix_invalid are used.
Extract_type	Optional. The extract () function checks whether each key name is a valid variable name, and also checks to see if the variable name already exists in the symbol table conflicts. The handling of the incompatible and conflicting key names will be determined according to this parameter. Possible values: Extr_overwrite-Default. If there is a conflict, overwrite the existing variable. Extr_skip-If there is a conflict, do not overwrite existing variables. Extr_prefix_same-If there is a conflict, precede the variable name with the prefix PREFIX. Extr_prefix_all-Prefix all variable names PREFIX. Extr_prefix_invalid-prefix PREFIX only for illegal or numeric variable names. Extr_if_exists-overwrites their values only if there is already a variable of the same name in the current symbol table. Nothing else is to be dealt with. Extr_prefix_if_exists-the variable name with the prefix appended is established only if there is already a variable with the same name in the current symbol table. Extr_refs-Extracts a variable as a reference. The imported variable still references the value of the array parameter.
Prefix	Optional. Note that prefix is required only if the Extract_type value is Extr_prefix_same, Extr_prefix_all, Extr_prefix_invalid, or extr_prefix_if_exists. If the result appended with a prefix is not a valid variable name, it will not be imported into the symbol table. An underscore is automatically added between the prefix and array key names.

return value

Returns the number of variables successfully imported into the symbol table.

Instance:

<?php
$size = "large";
$var _array = Array (
  "color" => "Blue",
  "size" => "medium",
  "shape" => "sphere"
);
Extract ($var _array, Extr_prefix_same, "Wddx");
echo "$color, $size, $shape, $wddx _size <br/>";
>  

Run Result:

Blue, large, sphere, medium.

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