当只有一个数组时，文本文件计数返回为2

Could someone please tell me when the decoded contents returns as count = 2 instead of 1?

I presume if the decode array was there then it should be a count of 1 because it's not got multiple array objects inside it.

Example:

// Count 1
Array ( [chat_id] => 414 [inserted] => 1500038898 )

// Count 2 
Array ( 
[0] => Array ([chat_id] => 414 [inserted] => 1500038898) 
[1] => Array ([chat_id] => 415 [inserted] => 1500038898) 
)

Text file contents:

{"chat_id":414,"inserted":1500038898}

Code:

// Get file contents
$fileContents = json_decode(file_get_contents($file), true);

if($fileContents !== NULL){
    // Push decoded contents to temp array
    $decoded_data = $fileContents;
    print_r(count($decoded_data));
}

Decoded:

Array ( [chat_id] => 414 [inserted] => 1500038898 )

Dude, as I told you in my first comment, it is not an array that's there in the JSON. Okay, so JSON data is not upto your input's requirement. Change your JSON data to:

[{"chat_id":414,"inserted":1500038898}]

This should give you 1 instead of 2. The above is what you need for single entry. An example of two records, like how you wanted might be looking like:

[{"chat_id":414,"inserted":1500038898}, {"chat_id":415,"inserted":1500038898}]

I hope I was clear in explaining. You are missing []. It should be an array of objects [{}] not just an object {}.