PHP - 更改JSON文件中的值

Question

I have the below php code that receives some variables from another page (sent via POST).

Based on the Ad_id and Name... i'm trying to toggle the status between 'active or 'inactive'.

However when i execute this (with correct POST data)... it doesn't seem to update anything. What am i doing wrong?

e.g. When i send through a valid ad, name & status... then go and check the JSON file, it asn't toggled 'active' to 'inactive'.

PHP:

<?php

// Get the post variables
$ad_id = $_GET['ad']; 
$name = $_GET['name']; 
$status = $_GET['status']; 

// Get the JSON file
$json = file_get_contents('test.json');

// Decode Json into an array
$json = json_decode($json,true);

// Within the array.. find the ad that matches the POST variable.
foreach ($json['ads'] as $ad) {
    if ($ad['id'] == $ad_id) {

        // Within that Ad... find the candidate that matches the POST variable.
        foreach ($ad['candidates'] as $candidate) {
            if ($candidate['name'] == $name) {

                // Within that candidate... check the value of 'status'.
                if ($candidate['status'] == 'active') {

                    // If active, update the status to 'inactive'.
                    $candidate['status'] = 'inactive';

                } else {

                    // If inactive, update the status to 'active'.
                    $candidate['status'] = 'active';

                }

            }

        }

    }

}

// Encode the array as JSON again
$json = json_encode($json);

// Save the JSON back to the server
file_put_contents('test.json', $json, LOCK_EX);

?>

JSON:

{
    "ads": [
        {
            "id": "12345678",
            "hirername": "Demo Bar",
            "candidates": [
                {
                    "status": "active",
                    "name": "Gregory Jones",
                    "dist": "Richmond (4km away)",
                    "exp1": "Barman at City Bar for 2 years",
                    "avail1": "Mon to Fri - Morning, Evening & Night",
                    "visa": "Australian Citizen",
                    "call": "0413451222"
                },
                {
                    "status": "active",
                    "name": "Jackie Linton",
                    "dist": "Box Hill (13km away)",
                    "exp1": "Bar girl at Collins Bar for 1 year",
                    "avail1": "Mon to Fri - Morning & Evening",
                    "visa": "Working holiday visa",
                    "call": "0413456555"
                }
            ]
        }
    ]
}

Answer 1

You should iterate your data by links with foreach($items as &$item) syntax.
Then all changes will be in the original structure.

Now, you create copies, while iterate, modify copies, and nothing changed.

// Get the post variables
$ad_id = $_GET['ad']; 
$name = $_GET['name']; 
$status = $_GET['status']; 

// Get the JSON file
$json = file_get_contents('test.json');

// Decode Json into an array
$json = json_decode($json,true);

// Within the array.. find the ad that matches the POST variable.
foreach ($json['ads'] as &$ad) {
    if ($ad['id'] == $ad_id) {

        // Within that Ad... find the candidate that matches the POST variable.
        foreach ($ad['candidates'] as &$candidate) {
            if ($candidate['name'] == $name) {

                // Within that candidate... check the value of 'status'.
                if ($candidate['status'] == 'active') {

                    // If active, update the status to 'inactive'.
                    $candidate['status'] = 'inactive';

                } else {

                    // If inactive, update the status to 'active'.
                    $candidate['status'] = 'active';
                    }

            }

        }

    }

}

// Encode the array as JSON again
$json = json_encode($json);

// Save the JSON back to the server
file_put_contents('test.json', $json, LOCK_EX);