extractPHP ManualPrevNextextractextract --
Import variables into the symbol table from an array
Descriptionvoid extract(array var_array, int
[extract_type]
, string
[prefix]
);
This function is used to import variables from an array into the
current symbol table. It takes associative array
var_array and treats keys as variable
names and values as variable values. For each key/value pair it
will create a variable in the current symbol table, subject to
extract_type and
prefix parameters.
extract() checks for colissions with existing
variables. The way collisions are treated is determined by
extract_type. It can be one of the
following values:
EXTR_OVERWRITE
If there is a collision, overwrite the existing variable.
EXTR_SKIP
If there is a collision, don't overwrite the existing
variable.
EXTR_PREFIX_SAMEIf there is a collision, prefix the new variable with
prefix.
EXTR_PREFIX_ALL
Prefix all variables with prefix.
If extract_type is not specified, it is
assumed to be EXTR_OVERWRITE.
Note that prefix is only required if
extract_type is EXTR_PREFIX_SAME or
EXTR_PREFIX_ALL.
extract() checks each key to see if it
constitues a valid variable name, and if it does only then does
it proceed to import it.
A possible use for extract is to import into symbol table
variables contained in an associative array returned by
wddx_deserialize().
Example 1. Extract() example 1
2 <php?
3
4 /* Suppose that $var_array is an array returned from
5 wddx_deserialize */
6
7 $size = "large";
8 $var_array = array ("color" => "blue",
9 "size" => "medium",
10 "shape" => "sphere");
11 extract ($var_array, EXTR_PREFIX_SAME, "wddx");
12
13 print "$color, $size, $shape, $wddx_size\n";
14
15 ?>
16
The above example will produce:
1
2 blue, large, sphere, medium
3
The $size wasn't overwritten, becaus we specified
EXTR_PREFIX_SAME, which resulted in $wddx_size being created.
If EXTR_SKIP was specified, then $wddx_size wouldn't even have
been created. EXTR_OVERWRITE would have cause $size to have
value "medium", and EXTR_PREFIX_ALL would result in new
variables being named $wddx_color, $wddx_size, and $wddx_shape.
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