PUSHES one or more elements to the ending of an ARRAY.
<?php
int array_push ( arr &$array [, mix $val1, ..., $valN ] )
where,
$array = The given input ARRAY
$val1 = First value to push
...
$valN = Nth value to push
?>
EXERCISE
<?php
echo 'The given ARRAY:<br>';
$arr01 = array(2, 4, 6, 8, 10);
print_r($arr01);
echo '<br>' . count($arr01) . ' ELEMENTS<br><br><br>';
// ELEMENTS TO INSERT
$val01a = 12;
$val01b = 14;
$val01c = 16;
$new01 = array_push($arr01, $val01a, $val01b, $val01c);
echo 'Resulting ARRAY:<br>';
print_r($arr01);
echo '<br>' . $new01 . ' ELEMENTS';
?>
EXERCISE
<?php
$arr02 = ['two' => 2, 'four' => 4,
'six' => 6, 'eight' => 8, 'ten' => 10];
echo 'The given ARRAY:<br>';
print_r($arr02);
echo '<br><br>' . count($arr02) . ' ELEMENTS<br><br><br>';
$new02 = array_push($arr02, 12, 14, 16);
echo 'Resulting ARRAY:<br>';
print_r($arr02);
echo '<br>' . $new02 . ' ELEMENTS';
?>
EXERCISE
<?php
$arr03 = ['two' => 2, 'four' => 4,
'six' => 6, 'eight' => 8, 'ten' => 10];
echo 'The given ARRAY:<br>';
print_r($arr03);
echo '<br>' . count($arr03) . ' ELEMENTS<br><br><br>';
// TO INSERT
$arr03a = ['twelve' => 12, 'fourteen' => 14, 'sixteen' => 16];
echo 'The ARRAY to insert:<br>';
print_r($arr03a);
echo '<br>' . count($arr03a) . ' ELEMENTS<br><br><br>';
$new03 = array_push($arr03, $arr03a);
echo 'The result ARRAY:<br>';
print_r($arr03);
echo '<br>' . $new03 . ' ELEMENTS';
?>
EXERCISE
<?php
$empty_array = [];
$number = 5;
$str = "abc";
/* Various combinations of arrays
to be used for the test */
$mixed_array = [
[],
[ 1,2,3,4,5,6,7,8,9 ],
[ "One", "_Two", "Three", "Four", "Five" ],
[ 6, "six", 7, "seven", 8, "eight", 9, "nine" ],
[ "a" => "aaa", "A" => "AAA", "c" => "ccc",
"d" => "ddd", "e" => "eee" ],
[ "1" => "one", "2" => "two", "3" => "three",
"4" => "four", "5" => "five" ],
[ 1 => "one", 2 => "two", 3 => 7, 4 => "four", 5 => "five" ],
[ "f" => "fff", "1" => "one",
4 => 6, "" => "blank", 2.4 => "float", "F" => "FFF",
"blank" => "", 3.7 => 3.7, 5.4 => 7,
6 => 8.6, '5' => "Five", "4name" => "jonny",
"a" => NULL, NULL => 3 ],
[ 12, "name", 'age', '45' ],
[ ["oNe", "tWo", 4], [10, 20, 30, 40, 50], [] ],
[ "one" => 1, "one" => 2, "three" => 3,
3, 4, 3 => 33, 4 => 44, 5, 6,
5.4 => 54, 5.7 => 57,
"5.4" => 554, "5.7" => 557 ]
];
/* Error Conditions */
echo "Testing Edge Conditions:<br>";
/* Invalid Number of arguments */
var_dump( array_push($mixed_array[1],1,2) );
echo '<br><br>';
/* Empty Array as argument */
var_dump( array_push($empty_array, 2) );
/* Loop to test normal functionality
with different arrays inputs */
echo "<br><br>Testing with various array inputs:<br>";
$counter = 1;
foreach( $mixed_array as $sub_array )
{
echo "<br><br>Input Array for Iteration $counter is:<br>";
print_r( $sub_array );
echo "<br>Output after push is:<br>";
var_dump( array_push($sub_array, 22, "abc") );
$counter++;
echo '<br><br>';
}
/* Checking for return value and the
new array formed from push operation */
echo "<br><br>Checking for return value
and the new array formed from push operation:<br>";
var_dump( array_push($mixed_array[2], 22, 33, "44") );
echo '<br><br>';
var_dump( $mixed_array[2] );
?>
EXERCISE
<?php
/*
* Test basic functionality of array_push
* with indexed and associative arrays
*/
echo "Testing array_push():<br>basic functionality:<br><br>";
$array = array ('zero', 'one', 'two');
$var1 = 'three';
$var2 = 'four';
echo "<br>Push values onto an indexed array:<br>";
var_dump(array_push($array, $var1, $var2));
echo '<br><br>';
var_dump($array);
$array_assoc = array ('one' => 'un', 'two' => 'deux');
echo "<br><br>Push values onto an associative array:<br>";
var_dump(array_push($array_assoc, $var1, $var2));
echo '<br><br>';
var_dump($array_assoc);
?>
EXERCISE
<?php
$array = [1,2,3];
$values = [];
var_dump( array_push($array) );
echo '<br><br>';
var_dump( array_push($array, ...$values) );
echo '<br><br>';
var_dump( $array );
?>
EXERCISE
<?php
/*
* Test array_push when passed:
* 1. an array as $var arg
* 2. as sub-array as $stack arg
*/
echo "Testing array_push():<br>usage variations<br><br>";
echo "Pass array as \$var argument:<br>";
$array = array(1, 2, 3);
$sub_array = array('one', 'two');
var_dump(array_push($array, $sub_array));
echo '<br><br>';
var_dump($array);
echo "<br><br>Pass sub-array as \$stack argument:<br>";
var_dump(array_push($array[3], 'a'));
echo '<br><br>';
var_dump($array);
?>
EXERCISE
<?php
/*
* Check the position of the internal
* array pointer after calling array_push()
*/
echo "Testing array_push():<br>usage variations<br><br>";
$stack = array ('one' => 'un', 'two' => 'deux');
$var0 = 'zero';
echo "<br> Call array_push()<br>";
var_dump($result = array_push($stack, $var0));
echo "<br><br>Position of Internal Pointer in Original Array:<br>";
echo key($stack) . " => " . current ($stack);
?>
EXERCISE
<?php
/*
* Pass array_push arrays where
* the keys are different data types.
*/
echo "Testing array_push():<br>usage variations<br><br>";
// Initialise function arguments not being substituted
$var = 'value';
//get an unset variable
$unset_var = 10;
unset ($unset_var);
// heredoc string
$heredoc = <<<EOT
hello world
EOT;
// arrays of different data types as keys
// to be passed to $stack argument
$inputs = array(
// int data
/*1*/ 'int' => array(
0 => 'zero',
1 => 'one',
12345 => 'positive',
-2345 => 'negative',
),
// float data
/*2*/ 'float' => array(
10.5 => 'positive',
-10.5 => 'negative',
.5 => 'half',
),
'extreme floats' => array(
12.3456789000e10 => 'large',
12.3456789000E-10 => 'small',
),
// null data
/*3*/ 'null uppercase' => array(
NULL => 'null 1',
),
'null lowercase' => array(
null => 'null 2',
),
// boolean data
/*4*/ 'bool lowercase' => array(
true => 'lowert',
false => 'lowerf',
),
'bool uppercase' => array(
TRUE => 'uppert',
FALSE => 'upperf',
),
// empty data
/*5*/ 'empty double quotes' => array(
"" => 'emptyd',
),
'empty single quotes' => array(
'' => 'emptys',
),
// string data
/*6*/ 'string' => array(
"stringd" => 'stringd',
'strings' => 'strings',
$heredoc => 'stringh',
),
// undefined data
/*8*/ 'undefined' => array(
@$undefined_var => 'undefined',
),
// unset data
/*9*/ 'unset' => array(
@$unset_var => 'unset',
),
);
// loop through each sub-array of $inputs to
// check the behavior of array_push()
$iterator = 1;
foreach($inputs as $key => $input) {
echo "<br>Iteration $iterator : $key data<br>";
echo "Before : ";
var_dump(count($input));
echo "<br><br>After : ";
var_dump( array_push($input, $var) );
$iterator++;
};
?>