第一章,设置环境,介绍了如何设置不同的开发环境,包括在 Windows、不同的 Linux 发行版上安装 NGINX、PHP 7 和 Percona Server,以及为开发目的设置 Vagrant 虚拟机。 第二章,PHP 7 的新特性,介绍了 PHP 7 引入的主要新特性,包括类型提示、组使用声明、匿名类和新操作符,如太空船操作符、空合并操作符和统一变...
($a1); // 反转数组 keyvalue交换 array_slice((array) $output, $start, $count); // 裁剪数组 /** * 数组排序 **/ function sortArrByField(&$array, $field, $desc = false) { $fieldArr = []; foreach ($array as $k => $v) { $fieldArr[$k] = $v[$field]; } $sortType = ...
创建数组 count($array) 统计数组元素个数 list($a,$b) 将数组的键和值赋给一些变量 key($array) 获取当前元素的键 current($array) 获取当前元素的值 next...end($array) 将指针移动到最后一个数组元素,并返回该元素的值 sort($array,flag) 正序,改变数组下标 rsort($array,flag) 倒序,改变数组下标 ...
is_integer:判断整型 is_object:判断对象 is_array:判断数组 is_string:判断字符串 is_resource:判断资源 is_scalar:scalar是标量的,判断是基本数据类型:整型,浮点型,布尔型和字符串型 is_null 检测变量是否为NULL 是返回TRUE 否则返回false。1.被赋值为NULL;2.变量没被赋值;3.被unset() is_numeric:判断数字...
If the item is an object, the property is accessed using $item->{$attr}.If it’s an array, the key is accessed as $item[$attr]. Each item is added to $sortedItems, keyed by the attribute value. Sort the Array:The array is sorted based on the $order parameter: If $order is '...
Prior to PHP 8.2, when using ksort() with the SORT_REGULAR flag, keys would be sorted such that alphabetical keys appeared before numerical keys. However, this behavior is different than every other sort function in PHP. As such, starting in PHP 8.2, using ksort() with the SORT_REGULAR ...
object - Inspect the internals of Redis objects persist - Remove the expiration from a key randomKey - Return a random key from the keyspace rename - Rename a key renameNx - Rename a key, only if the new key does not exist type - Determine the type stored at key sort - Sort the elem...
11$value=$request->session()->get('key'); 12 13// 14} Database Collections Thefluent query buildernow returnsIlluminate\Support\Collectioninstances instead of plain arrays. This brings consistency to the result types returned by the fluent query builder and Eloquent. ...
rsort() - Sort array in descending numerical orderasort() - Sort array in ascending order, according to valueksort() - Sort array in ascending order, according to keyarsort() - Sort array in descending order, according to valuekrsort() - Sort array in descending order, according to key...
ArrayObject::ksort— Sort the entries by key说明 public ArrayObject::ksort ( void ) : void Sorts the entries by key, maintaining key to entry correlations. This is useful mainly for associative arrays. 参数 此函数没有参数。返回值 没有返回值。 范例...