foreach ($arrays as $key => $array) { if (is_array($array) && !empty($array)) { $first_element = reset($array); // Do something with $first_element } } 复制代码 如果您需要在多个地方重置同一个数组,可以考虑将 reset() 函数封装在一个自定义函数中,以便于代码重用和维护。function rese...
在循环中处理数组元素:在循环中处理数组元素时,有时需要在每次迭代后重置内部指针以访问下一个元素。 $array = array("a", "b", "c", "d"); while (list($key, $value) = each($array)) { echo "Key: " . $key . ", Value: " . $value . "\n"; // 重置数组内部指针 reset($array);...
current() 返回当前指针指向的数组元素,如果当前元素为空返回false key()返回当前指针指向元素的键名 */ echo""; /**/ $arr=array("houdunwang.com","后盾网PHP视频",array("php课程","css课程","thinkphp课程")); echocount($arr,1); $arr2=array("houdunwang.com","后盾网PHP视频",0,"mysql视频"...
1<?php2$arr1=[];3$arr2= [false,true];4var_dump(reset($arr1) ===reset($arr2)); 例子二: 1<?php2$arr= ['key1' => 'value1', 'key2' => 'value2'];34$keys=array_keys($arr);5print_r(reset($keys));67reset($arr);8print_r(key($arr));...
As for taking first key of an array, it's much more efficient to RESET and then KEY, rather then RESET result of ARRAY_KEYS (as sugested by gardnerjohng at gmail dot com).<?phpreset($someArray);echo key($someArray);?>This will give the same result but is much much faster. Large...
""; // Moves the internal pointer to the first element of the array, which is Peter echo next($people) . ""; // The next element of Peter is Joe print_r (each($people)); // Returns the key and value of the current element (now Joe), and moves the internal pointer forward?>...
如果参数1为空(即{{#arrayreset:}}),清空所有数组($store->mArrays = [];) 否则遍历参数(并展开wikitext),移除指定数组($store->unsetArray( $arrayId )). 代码中也附带了函数 unsetArray 的源码,unset() 是 PHP 内置函数,用于销毁变量或数组元素。实际...
""; // Moves the internal pointer to the first element of the array, which is Peter echo next($people) . ""; // The next element of Peter is Joe print_r (each($people)); // Returns the key and value of the current element (now Joe), and moves the internal pointer forward?>...
'fruit5'=>'apple');//定义数组 while($fruit_name=current($array))//循环获取数组当前值 { if($fruit_name=='apple')//如果当前值为apple { echokey($array).'';//输出当前值的键名 } next($array);//数组指针下移一步 }//开源代码phpfensi.com...
PHP prev() 函数 php prev() 和 next() 的行为类似,不过它将内部指针倒回一位而不是前移一位。 用户1448800 2021/08/21 4280 PHP key() 函数 php current() 函数返回的是元素的值,而 key() 函数返回的是元素的键名。 用户1448800 2021/08/21 6930 php参考手册Array函数(完结了) combine <?php //ar...