Multidimensional array loop not showing all values in xml api

Question

I am working with uspto patent assignment api. I have just write a sample code to get the result. The result coming in xml format i parsed that xml and i want to display titles using foreach loop but showing only one value.

index.php

<?php

$data = file_get_contents('usptodata.xml');
$arr =  simplexml_load_string($data);
foreach($arr->result as $values){
    echo $values->doc->str[6];  
}

?>

usptodata.xml

[result] => SimpleXMLElement Object
        (
            [doc] => Array
                (
                    [0] => SimpleXMLElement Object
                        (
                            [str] => Array
                                (
                                    [0] => 41196-840
                                    [1] => 041196-0840
                                    [2] => 41196
                                    [3] => 840
                                    [4] => N
                                    [5] => 3
                                    [6] => ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).
                                    [7] => Y
                                    [8] => 0879-1385PUS2
                                    [9] => BIRCH, STEWART, KOLASCH & BIRCH, LLP
                                    [10] => 8110 GATEHOUSE ROAD, SUITE 100 EAST
                                    [11] => FALLS CHURCH, VA 22042-1248
                                    [12] => METHOD FOR INSERTING MEDICAL INSTRUMENT
                                    [13] => en
                                    [14] => 14046630
                                    [15] => NULL
                                    [16] => Paul CURCILLO
                                    [17] => NULL
                                    [18] => NULL
                                    [19] => 20140100431
                                    [20] => CURCILLO, PAUL
                                    [21] => THE INSTITUTE FOR CANCER RESEARCH D/B/A FOX CHASE CANCER CENTER
                                )                           
                        )

                    [1] => SimpleXMLElement Object
                        (
                            [str] => Array
                                (
                                    [0] => 41166-549
                                    [1] => 041166-0549
                                    [2] => 41166
                                    [3] => 549
                                    [4] => N
                                    [5] => 2
                                    [6] => CONFIRMATORY LICENSE (SEE DOCUMENT FOR DETAILS).
                                    [7] => Y
                                    [8] => MEMORIAL SLOAN KETTERING CANCER CENTER
                                    [9] => 1275 YORK AVE, BOX 524
                                    [10] => OFFICE OF TECHNOLOGY DEVELOPMENT
                                    [11] => NEW YORK, NY 10065
                                    [12] => KRAS MUTATIONS AND RESISTANCE TO ANTI-EGFR TREATMENT
                                    [13] => en
                                    [14] => 14790492
                                    [15] => NULL
                                    [16] => Federica Di Nicolantonio, David B. Solit, Alberto Bardelli, Salvatore Siena
                                    [17] => NULL
                                    [18] => NULL
                                    [19] => 20160095920
                                    [20] => SLOAN-KETTERING INSTITUTE FOR CANCER RESEARCH
                                    [21] => NATIONAL INSTITUTES OF HEALTH - DIRECTOR DEITR
                                )
                       )
            )

In output only single title is coming like this. "ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS).". How can i get all index[6] titles.

Answer 1

I suppose it should be:

$data = file_get_contents('usptodata.xml');
$arr =  simplexml_load_string($data);
// proper variant
foreach($arr->result->doc as $cur_doc){
    echo $cur_doc->str[6] . PHP_EOL;  
}

Explanation: as you have result object, which is a part of $arr you need to iterate it's doc property, so it is $arr->result->doc.

In you initial case: $arr->result means "iterate over all subitems of result", but result has only one subitem: doc. So your foreach takes just doc without going deeper and iterating over doc subitems.