array_unshift
Prepend one or more elements to the beginning of an array
&reftitle.description;
intarray_unshift
arrayarray
mixedvalues
array_unshift prepends passed elements to the front
of the array. Note that the list of elements is
prepended as a whole, so that the prepended elements stay in the same
order. All numerical array keys will be modified to start counting from
zero while literal keys won't be changed.
¬e.reset-index;
&reftitle.parameters;
array
The input array.
values
The values to prepend.
&reftitle.returnvalues;
Returns the new number of elements in the array.
&reftitle.changelog;
&Version;
&Description;
7.3.0
This function can now be called with only one parameter. Formerly, at
least two parameters have been required.
&reftitle.examples;
<function>array_unshift</function> example
]]>
&example.outputs;
string(5) "apple"
[1] =>
string(9) "raspberry"
[2] =>
string(6) "orange"
[3] =>
string(6) "banana"
}
]]>
Usage with associative arrays
If one associative array is prepended to another associative array,
the prepended array is numerically indexed into the former array.
[
'McIntosh' => 'red',
'Granny Smith' => 'green',
],
'oranges' => [
'Navel' => 'orange',
'Valencia' => 'orange',
],
];
$vegetables = [
'lettuce' => [
'Iceberg' => 'green',
'Butterhead' => 'green',
],
'carrots' => [
'Deep Purple Hybrid' => 'purple',
'Imperator' => 'orange',
],
'cucumber' => [
'Kirby' => 'green',
'Gherkin' => 'green',
],
];
array_unshift($foods, $vegetables);
var_dump($foods);
?>
]]>
&example.outputs;
array(3) {
["lettuce"]=>
array(2) {
["Iceberg"]=>
string(5) "green"
["Butterhead"]=>
string(5) "green"
}
["carrots"]=>
array(2) {
["Deep Purple Hybrid"]=>
string(6) "purple"
["Imperator"]=>
string(6) "orange"
}
["cucumber"]=>
array(2) {
["Kirby"]=>
string(5) "green"
["Gherkin"]=>
string(5) "green"
}
}
["apples"]=>
array(2) {
["McIntosh"]=>
string(3) "red"
["Granny Smith"]=>
string(5) "green"
}
["oranges"]=>
array(2) {
["Navel"]=>
string(6) "orange"
["Valencia"]=>
string(6) "orange"
}
}
]]>
&reftitle.seealso;
array_merge
array_shift
array_push
array_pop