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pos()
函数输出数组中的当前元素的值:
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo pos($people) . "<br>";
?>
执行结果
Peter
pos()
函数返回数组中的当前元素的值。
该函数是 current() 函数的别名。
每个数组中都有一个内部的指针指向它的"当前"元素,初始指向插入到数组中的第一个元素。
提示:该函数不会移动数组内部指针。
相关的方法:
pos(array)
参数 | 描述 |
---|---|
array | 必需。规定要使用的数组。 |
#1 所有相关方法的演示:
<?php
$people = array("Peter", "Joe", "Glenn", "Cleveland");
echo current($people) . "<br>"; // The current element is Peter
echo next($people) . "<br>"; // The next element of Peter is Joe
echo current($people) . "<br>"; // Now the current element is Joe
echo prev($people) . "<br>"; // The previous element of Joe is Peter
echo end($people) . "<br>"; // The last element is Cleveland
echo prev($people) . "<br>"; // The previous element of Cleveland is Glenn
echo current($people) . "<br>"; // Now the current element is Glenn
echo reset($people) . "<br>"; // Moves the internal pointer to the first element of the array, which is Peter
echo next($people) . "<br>"; // The next element of Peter is Joe
print_r (each($people)); // Returns the key and value of the current element (now Joe), and moves the internal pointer forward
?>
执行结果
Peter
Joe
Joe
Peter
Cleveland
Glenn
Glenn
Peter
Joe
Array ( [1] => Joe [value] => Joe [0] => 1 [key] => 1 )