How to convert multi-dimensional array to single-dimensional array in php

phpThe method to convert a multi-dimensional array to a single-dimensional array is: 1. Create a PHP sample file; 2. Create a new empty array to store all values; 3. Traverse each element, and when encountering When there are more arrays, call the recursive function to merge the array passed to it with the current result; 4. Add each value in the array to the new array.

To convert a multi-dimensional array into a single-dimensional array, you can use recursive functions and loops.

The steps are as follows:

1. Create a new empty array to store all values

2. Traverse each element, Call the recursive function when more arrays are encountered

3. Add each value in the array to a new array

The following is the implementation PHP code example for the above steps:

functionflatten_array($array){
$result=array();
foreach($arrayas$value){
if(is_array($value)){
$result=array_merge($result,flatten_array($value));
}else{
$result[]=$value;
}
}
return$result;
}
//示例：
$multidimensional_array=array(
'a'=>array('b','c'),
'd'=>array('e',array('f','g')),
'h'=>'i',
);
$flattened_array=flatten_array($multidimensional_array);
print_r($flattened_array);//输出[b,c,e,f,g,i]

In the above example, we defined the `flatten_array()` function to convert a multi-dimensional array into a single-dimensional array. This function uses the `is_array()` function to check if the current value is an array. If so, the `flatten_array()` function is called recursively and the array passed to it is merged with the current result; otherwise, the current value is added to the result array. Finally, the result array is returned.

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