How to convert two-dimensional array to string in php

Conversion steps: 1. Use the array_reduce() function to convert a two-dimensional array into a one-dimensional array. The syntax "array_reduce(two-dimensional array, 'array_merge', array())" will return a two-dimensional array containing A one-dimensional array of all element values ​​in the array; 2. Use the implode() function to convert the one-dimensional array into a string, with the syntax "implode("separator", one-dimensional array)".

The operating environment of this tutorial: windows7 system, PHP version 8.1, DELL G3 computer

In PHP, you can use the array_reduce() function and implode() function to convert a two-dimensional array into a string.

Implementation steps:

Step 1: Use the array_reduce() function to convert a two-dimensional array into a one-dimensional array

The array_reduce() function sends the values ​​in the array to a user-defined function and returns a string.

array_reduce(array,myfunction,initial)

Parameters	Description
array	Required . Specifies an array.
myfunction	Required. Specifies the name of the function.
initial	Optional. Specifies the first value sent to the function for processing.

You only need to use array_reduce() to call the array_merge() function to convert the two-dimensional array into a one-dimensional array

$result = array_reduce($user, function ($result, $value) {
  return array_merge($result, array_values($value));
}, array())

Because the array_merge function will convert the same Arrays of string key names are overwritten and merged, so the values ​​must be retrieved using array_value before merging.

If the second dimension is a numeric key name, then just do this:

$result = array_reduce($user, 'array_merge', array())

will return a one-dimensional array containing all element values ​​in the two-dimensional array, example:

 array(100, 'a1'),
  'b' => array(101, 'a2'),
  'c' => array(102, 'a3'),
  'd' => array(103, 'a4'),
  'e' => array(104, 'a5'),
);
echo "原二维数组：";
var_dump($user);
$result = array_reduce($user, 'array_merge', array());
echo "转为一维数组后：";
var_dump($result);
?>

Step 2: Use the implode() function to convert the one-dimensional array into a string

implode() function can convert A one-dimensional array is converted into a string. The syntax format is as follows:

implode([$glue,]$array)

• $glue is used to set a string, indicating that $glue is used to connect each element of the array together. The default In this case, $glue is an empty string;

• $array is the array that needs to be converted.

Note: The $glue parameter of the implode() function is optional and can be omitted; the default connector is "" (empty string).

 array(100, 'a1'),
  'b' => array(101, 'a2'),
  'c' => array(102, 'a3'),
  'd' => array(103, 'a4'),
  'e' => array(104, 'a5'),
);
echo "原二维数组：";
var_dump($user);
$result = array_reduce($user, 'array_merge', array());
echo "转为一维数组后：";
var_dump($result);

echo "转为字符串后：";
var_dump(implode("",$result));
var_dump(implode("-",$result));
var_dump(implode(" ",$result));
?>

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