


Judgment method: 1. Loop through the two-dimensional array, the syntax "foreach($arr as $v){}" will assign the current sub-array to "$v"; 2. In the loop body, Use in_array() to determine whether the specified value is in the subarray, the syntax is "in_array("value",$v)", if so, it returns TRUE.
The operating environment of this tutorial: windows7 system, PHP8.1 version, DELL G3 computer
How to determine the value of php Whether it is in a two-dimensional array
In PHP, you can use the foreach statement and the in_array function to determine whether the value is in a two-dimensional array.
1. Use the foreach statement to loop through the two-dimensional array
<?php header("Content-type:text/html;charset=utf-8"); $arr = array( array("a", "aa", "aaa"), array("b", "bb", "bbb"), array("c", "cc", "ccc") ); foreach($arr as $v){ } ?>
Traverse the given two-dimensional array, and in each loop, add the children of the current array Array is assigned to $v
.
2. In the loop body, use in_array() to determine whether the specified value is in the subarray
in_array(search,array) Search whether the specified value exists in the array Value; returns TRUE if the value is found in the array, FALSE otherwise.
foreach($arr as $v){ if(in_array("bb",$v)){ echo "指定值在二维数组中"; } }
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求和方法:1、用array_column()获取多维数组中指定一列的全部元素,语法“rray_column(数组, '指定列名')”,会返回一个包含全部元素的结果数组;2、用“array_sum(结果数组)”计算结果数组中所有元素的和即可。

增加元素的方法:1、使用array_push()函数,语法“array_push(二维数组,值1,值2...);”;2、使用array_splice()函数,语法“array_splice(二维数组,count(二维数组),0,元素值)”。

获取方法:1、用“array_values(数组)”将指定数组转为索引数组;2、用“array_search(数值,索引数组)”,在索引数组中搜索数值,返回对应的索引值(下标);3、用“索引值+1”语句获取元素在数组中的位置值。

php数组里面可以放数组。PHP数组可以存储所有类型的数据,当然也包括数组本身;如果一个数组中的元素是另一个数组,就构成了包含数组的数组,即多维度数组。数组的不同维度标志着需用几个下标(索引)来获取对应的数组元素,比如二维数组需用两个下标。

方法:1、循环遍历数组,语法“foreach($arr as $k=>$v){}”;2、循环体中,用“==”判断元素值是否为null,如果是则用unset()删除该元素,语法“if($v==null){unset($arr[$k]);}”。

php中只比较值的数组交集函数是“array_intersect()”;该函数用于比较两个(或更多个)数组的键值,语法“array_intersect(数组1,数组2...)”,会返回一个交集数组,所包含的值是从被比较的数组(数组1)中取。

去掉方法:1、用“sort($arr)”对数组进行升序排序,排序后该数组的第一个元素就是最小值,最后一个元素就是最大值;2、用“array_pop($arr)”删除最后一个元素,用“array_shift($arr)”删除第一个元素即可。

php中可用preg_match_all()配合正则表达式过滤字符串,只获取中文字符;语法“preg_match_all("/[\x{4e00}-\x{9fff}]+/u","$str",$arr);”,会将匹配字符存入“$arr”数组中。


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