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)

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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