Possible Duplicate:
Parsing JSON file with PHP
Can anyone suggest an elegant way to change an array of the form below to an array containing only the primary keys, using php?
[{
"PrimaryKey": "489",
"name": "Ted"
}, {
"PrimaryKey": "488",
"name": "Bill"
}, {
"PrimaryKey": "487",
"singleFbId": "Joe"
}]