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PHP基础（一）数组处理函数

来源：SegmentFault 2023-01-21 11:58:51 0浏览收藏

积累知识，胜过积蓄金银！毕竟在##column_title##开发的过程中，会遇到各种各样的问题，往往都是一些细节知识点还没有掌握好而导致的，因此基础知识点的积累是很重要的。下面本文《PHP基础（一）数组处理函数》，就带大家讲解一下MySQL、面试、Linux、PHP、lavarel知识点，若是你对本文感兴趣，或者是想搞懂其中某个知识点，就请你继续往下看吧~

$a = array(
        array('name' => 'zhangsan', 'age'=>12),
        array('name' => 'lisi', 'age'=>13),
        array('name' => 'wangwu', 'age'=>14)
    );
    
$b = array_column($a, 'name');
print_r($b);//Array ( [0] => zhangsan [1] => lisi [2] => wangwu )

$c = array_column($a, 'age', 'name');
print_r($c);//Array ( [zhangsan] => 12 [lisi] => 13 [wangwu] => 14 )

$keys = array("zhangsan","lisi","wangwu");
$values = array(11,12,13);

$c = array_combine($keys, $values);
print_r($c);//Array ( [zhangsan] => 11 [lisi] => 12 [wangwu] => 13 )

$a = ['zhangsan',1,'lisi','lisi','a'];
$b = array_count_values($a);
print_r($b);//Array ( [zhangsan] => 1 [1] => 1 [lisi] => 2 [a] => 1 )

$a = array_fill(-1,5,'a');
print_r($a);//Array ( [-1] => a [0] => a [1] => a [2] => a [3] => a )

$a = [1,2,3,4,10,11,23];
$b = array_filter($a,function($val){
    return $val > 5 ? true : false;
});
print_r($b);//Array ( [4] => 10 [5] => 11 [6] => 23 )

$a = array('zhangsan'=>'shanxi','lisi'=>'hubei','wangwu'=>'shanxi','zhaoliu'=>'shanghai');
$b = array_flip($a);
print_r($b);//Array ( [shanxi] => wangwu [hubei] => lisi [shanghai] => zhaoliu )

$a = ['name'=>'张三','age'=>12,'sex'=>'a','b'];
$b = ['name'=>'张三','age'=>11,'a','b'];
$c = array_intersect_assoc($a, $b);
print_r($c);//Array ( [name] => 张三 )

$a = ['name'=>'张三','age'=>12,'sex'=>'a','b'];
$b = ['name'=>'张三','age'=>11,'a','b'];
$c = array_intersect($a, $b);
printr_($c);//Array ( [name] => 张三 [sex] => a [0] => b )

含有类似功能的函数还有：

$a = ['name'=>'张三','age'=>12,'sex'=>'a','b'];
print_r(array_key_first($a));//name

$a = ['name'=>'张三','age'=>12,'sex'=>'a','b'];
print_r(array_key_last($a));// 0

$a = ['name'=>'张三','age'=>12,'sex'=>'a','b'];
$b = array_keys($a);
$c = array_keys($a, 12);
print_r($b);//Array ( [0] => name [1] => age [2] => sex [3] => 0 ) 
print_r($c);//Array ( [0] => age )

$a = [1,2,3,4,5];
$b = array_map(function($val){
    return $val*$val;
}, $a);
print_r($b);//Array ( [0] => 1 [1] => 4 [2] => 9 [3] => 16 [4] => 25 )

$a = ['name'=>1,'age'=>2,3];
$b = ['age'=>4,2,'sex'=>1];
$c = array_merge($a,$b);
print_r($c);//Array ( [name] => 1 [age] => 4 [0] => 3 [1] => 2 [sex] => 1 )

当两个数组相加时：

$a = ['name'=>1,'age'=>2,3];
$b = ['age'=>4,2,'sex'=>1];
$c = $a+$b;
print_r($c);//Array ( [name] => 1 [age] => 2 [0] => 3 [sex] => 1 )

$a = [1,2,3];
$c = array_pad($a, 5, 99);
print_r($c);//Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 99 [4] => 99 )

$c = array_pad($a, 2, 88);
print_r($c);// Array ( [0] => 1 [1] => 2 [2] => 3 )

$a = [1];
$b = array_pop($a);
print_r($a);//Array ( [0] => 1 [1] => 2 )
print_r($b);//3

$c = array_pop($a);
print_r($a);//Array ( [0] => 1 [1] => 2 )
print_r($b);//3

$a = [1,3,5,7,9];
$b = array_product($a);
print_r($b);//945

$c = [1,2,3,'a'];
$b = array_product($a);
print_r($b);//0

$a = [1,2,3];
$b = array_push($a,4,5);
print_r($a);//Array ( [0] => 1 [1] => 2 [2] => 3 [3] => 4 [4] => 5 )
print_r($b);//5

$a = [1,2,3,'a'=>4];
$b = array_reverse($a);
$c = array_reverse($a,true);
print_r($b);//Array ( [a] => 4 [0] => 3 [1] => 2 [2] => 1 )
print_r($c);//Array ( [a] => 4 [2] => 3 [1] => 2 [0] => 1 )

$a = ['a'=>1,'b'=>2,'c'=>1];
$b = array_search(1, $a);
print_r($b);// a

$a = [2,'a'=>1,3,4];
$b = array_shift($a);
print_r($a);// Array ( [a] => 1 [0] => 3 [1] => 4 )
print_r($b);// 2

$a = [1,2,3,'a'];
$b = array_sum($a);
print_r($b);//6

$a = [1,2,3,4];
$b = array_unshift($a, 0,9,8);
print_r($a);// Array ( [0] => 0 [1] => 9 [2] => 8 [3] => 1 [4] => 2 [5] => 3 [6] => 4 )
print_r($b);// 7

```
$a =['name' => 1,'age' => 2,'sex'=>3];
$b = array_walk($a, function(&$val, $key){
    $val += 1;
});
print_r($a);//Array ( [name] => 2 [age] => 3 [sex] => 4 ) 
```
到这里，我们也就讲完了《PHP基础（一）数组处理函数》的内容了。个人认为，基础知识的学习和巩固，是为了更好的将其运用到项目中，欢迎关注golang学习网公众号，带你了解更多关于mysql的知识点！

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