How to add element to array in php?

Question: How to add element to array?

$arrayData = array(0=>'one',1=>'two',3=>'three'); 
print_r($arrayData);
/*
 Array ( [0] => one [1] => two [3] => three ) 
 */
$arrayData['4']='four';


print_r($arrayData);
/**
Array ( [0] => one [1] => two [3] => three [4] => four ) 
 * 
 */

Question: How to add multiple element in array?

$arrayData = array(0=>'one',1=>'two',3=>'three'); 
print_r($arrayData);
/*
 Array ( [0] => one [1] => two [3] => three ) 
 */
$arrayData['4']='four';
$arrayData['5']='five';


print_r($arrayData);
/**
Array ( [0] => one [1] => two [3] => three [4] => four [5] => five ) 
 * 
 */

Question: How to replace multiple array element with single array?

$arrayData = array(0=>'one',1=>'two',3=>'three',4=>'four',5=>'five',6=>'six'); 
print_r($arrayData); echo "
";
/*
 * Array ( [0] => one [1] => two [3] => three [4] => four [5] => five [6] => six ) 
 */
array_splice($arrayData, 1,2,array('r'=>'replaced'));


print_r($arrayData);
/**
Array ( [0] => one [1] => replaced [2] => four [3] => five [4] => six ) 
 * 
 */

Question: How to add element to an begining of array?

$arrayData = array(0=>'one',1=>'two',3=>'three'); 
print_r($arrayData);
/*
Array ( [0] => one [1] => two [3] => three )  
 */
array_unshift($arrayData, "four", "five");


print_r($arrayData);
/**
Array ( [0] => four [1] => five [2] => one [3] => two [4] => three ) 
 * 
 */

Question: How to add elements at the end of array?

$arrayData = array(0=>'one',1=>'two',3=>'three'); 
print_r($arrayData);
/*
Array ( [0] => one [1] => two [3] => three )  
 */
array_push($arrayData, "four", "five");


print_r($arrayData);
/**
Array ( [0] => four [1] => five [2] => one [3] => two [4] => three ) 
 * 
 */

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