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    <p>change</p> <pre><code>array_push($com_study, $study_array[study]); </code></pre> <p>to</p> <pre><code>array_push($com_study, $study_array[$study]); // You missed a $ ^ here </code></pre> <p><strong>Edit:</strong><br> The following code outputs 3 'match found'. i don't know the values of <code>$common_words_array</code> and <code>$matching</code>, so i used some arbitrary values, also instead of using function <code>create_study_string_array</code> i just used explode. still confused, can't figure out what exactly you are trying to achieve.</p> <pre><code>&lt;?php $testarray = array (); $string = "this is a string"; $testarray = explode ( ' ', $string ); $common_words_array = array ( 'is', 'a', 'this' ); $matching = array ( 'a', 'and', 'this' ); $testarray = create_question ( $testarray, $matching, $common_words_array ); function create_question($study_array, $com_study, $common_words_array) { echo count ( $study_array ) . " total in study_array&lt;br&gt;"; echo count ( $common_words_array ) . " total in common_words_array&lt;br&gt;"; for($study = 0; $study &lt; count ( $study_array ); $study ++) { // echo "study is " . $study . "&lt;br&gt;"; for($common = 0; $common &lt; count ( $common_words_array ); $common ++) { // The issue happens right here. if (strcmp ( $study_array [$study], $common_words_array [$common] ) == 0) { echo "match found"; } } } $create_question_return_array = array (); $create_question_return_array [0] = $study_array; $create_question_return_array [1] = $com_study; return $create_question_return_array; } ?&gt; </code></pre> <p><em>Output:</em> </p> <pre><code>4 total in study_array 3 total in common_words_array match foundmatch foundmatch found </code></pre>
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