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Php to achieve json transfer array method: 1, create a PHP sample file; 2, define a JSON data; 3, through the "json_decode ($json,true)" method to convert json into an array.

This article operating environment: Windows7 system, PHP7.1 version, DELL G3 computer

How does php implement json to an array?

Json_decode ()

This function is used to convert json text into the corresponding PHP data structure.

Here is an example:

$json ='{"foo": 12345}'; $obj = json_decode ($json); print $obj- > {'foo'}; / / 12345

Normally, json_decode () always returns a PHP object, not an array. For example:

$json ='{"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}'; var_dump (json_decode ($json))

The result is a PHP object:

Object (stdClass) # 1 (5) {["a"] = > int (1) ["b"] = > int (2) ["c"] = > int (3) ["d"] = > int (4) ["e"] = > int (5)}

If you want to force the generation of PHP associative arrays, json_decode () needs to add a parameter, true:

$json ='{"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}'; var_dump (json_decode ($json,true))

The result is an associative array:

Array (5) {["a"] = > int (1) ["b"] = > int (2) ["c"] = > int (3) ["d"] = > int (4) ["e"] = > int (5)}

The following three ways of writing json are all wrong. Can you see where they are wrong?

Common errors of json_decode ()

$bad_json = "{'bar':' baz'}"; $bad_json ='{bar: "baz"}'; $bad_json ='{"bar": "baz",}'

The first mistake is that the json delimiter (delimiter) allows only double quotes, not single quotes. The second error is the "first name" of the json name-value pair (the part to the left of the colon), and double quotation marks must be used in all cases. The third error is that you cannot add a comma (trailing comma) after the last value. Executing json_decode () on all three strings returns null with an error.

In addition, json can only be used to represent objects (object) and arrays (array), and if you use json_decode () for a string or numeric value, null will be returned.

Var_dump (json_decode ("Hello World")); / / what language is nullphp php, a nested acronym that stands for English Hypertext preprocessing language (PHP:Hypertext Preprocessor). PHP is a kind of HTML embedded language. PHP is somewhat similar to Microsoft's ASP. It is a scripting language that embeds HTML documents on the server. The style of the language is similar to C language, and now it is widely used by many website programmers.

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