We have many elements that operate on arrays, let’s talk about some of them first in this section. In 6.3 we will summarize more common array functions.
The following functions are mainly used to move the array pointer and push in and pop out array elements.
Function Function ##array_shift array_unshift array_push array_pop current #key next prev reset end array_shift
##mixed array_shift ( array &$array )
Function: Pop the first element in the array
<?php
$mingren = array("鄧超", "黃曉明", "寧澤濤", "鐘漢良");
$dc = array_shift($mingren);
echo $dc .'<br />';
print_r($mingren);
?> Execution result:
Conclusion:
1. Pop out the first array element, changing the result of the original array
2. The pop-up value is assigned to $dc
array_unshift
int array_unshift (array &$array, mixed $value 1 [, mixed $... ] )
Function: Push one or more elements to the beginning of the index array, and return the total number.
<?php
$mingren = array("鄧超", "黃曉明");
$dc = array_unshift($mingren , "寧澤濤", "鐘漢良");
echo $dc .'<br />';
print_r($mingren);
?> The execution results are as follows:
array_pop
mixed array_pop (array &$array)
Function: pop up an element at the end of the array
<?php
$mingren = array("鄧超", "黃曉明", "寧澤濤", "鐘漢良");
$dc = array_pop($mingren);
echo $dc .'<br />';
print_r($mingren);
?> Execution result:
array_push
##int array_push ( array &$array , mixed $value1 [, mixed $... ] )
<?php
$mingren = array("鄧超", "黃曉明");
$dc = array_push($mingren , "寧澤濤", "鐘漢良");
echo $dc .'<br />';
print_r($mingren);
?> Execution result:
#current,key,prev,next,reset function demonstration
<?php
$t=array(
'我們',
'yy'=>'永遠(yuǎn)',
'dbg'=>'需要不斷奮進(jìn)',
'djn'=>'才能開(kāi)創(chuàng)未來(lái)'
);
//讀取數(shù)組的值
echo current($t).'<br />';
//讀取數(shù)組的鍵
echo key($t).'<br />';
//向后移動(dòng)一下
next($t);
//再讀值和鍵
echo current($t).'<br />';
echo key($t).'<br />';
//向后移動(dòng)一下
next($t);
echo current($t).'<br />';
echo key($t).'<br />';
//向前移動(dòng)一下
prev($t);
echo current($t).'<br />';
echo key($t).'<br />';
//移到末尾
end($t);
echo current($t).'<br />';
echo key($t).'<br />';
//移至開(kāi)始處
reset($t);
echo current($t).'<br />';
echo key($t).'<br />';
//銷毀數(shù)組
unset($t);
var_dump($t);
?>
<?php
$t=array(
'我們',
'yy'=>'永遠(yuǎn)',
'dbg'=>'需要不斷奮進(jìn)',
'djn'=>'才能開(kāi)創(chuàng)未來(lái)'
);
//讀取數(shù)組的值
echo current($t).'<br />';
//讀取數(shù)組的鍵
echo key($t).'<br />';
//向后移動(dòng)一下
next($t);
//再讀值和鍵
echo current($t).'<br />';
echo key($t).'<br />';
//向后移動(dòng)一下
next($t);
echo current($t).'<br />';
echo key($t).'<br />';
//向前移動(dòng)一下
prev($t);
echo current($t).'<br />';
echo key($t).'<br />';
//移到末尾
end($t);
echo current($t).'<br />';
echo key($t).'<br />';
//移至開(kāi)始處
reset($t);
echo current($t).'<br />';
echo key($t).'<br />';
//銷毀數(shù)組
unset($t);
var_dump($t);
?>
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