function array_to_json( $array ){     if( !is_array( $array ) ){         return false;     }     $associative = count( array_diff( array_keys($array), array_keys( array_keys( $array )) ));     if( $associative ){         $construct = array();         foreach( $array as $key => $value ){             // We first copy each key/value pair into a staging array,             // formatting each key and value properly as we go.             // Format the key:             if( is_numeric($key) ){                 $key = "key_$key";             }             $key = "'".addslashes($key)."'";             // Format the value:             if( is_array( $value )){                 $value = array_to_json( $value );             } else if( !is_numeric( $value ) || is_string( $value ) ){                 $value = "'".addslashes($value)."'";             }             // Add to staging array:             $construct[] = "$key: $value";         }         // Then we collapse the staging array into the JSON form:         $result = "{ " . implode( ", ", $construct ) . " }";     } else { // If the array is a vector (not associative):         $construct = array();         foreach( $array as $value ){             // Format the value:             if( is_array( $value )){                 $value = array_to_json( $value );             } else if( !is_numeric( $value ) || is_string( $value ) ){                 $value = "'".addslashes($value)."'";             }             // Add to staging array:             $construct[] = $value;         }         // Then we collapse the staging array into the JSON form:         $result = "[ " . implode( ", ", $construct ) . " ]";     }     return $result; }