php - MySQL Return Type Variance - NULL, EMPTY, FALSE -

-

why mysql -> php via pdo either return null, empty (array), or false when select query (and possibly other types) returns zero-result set?

i can't quite seem figure out in cases each different type returned... , hope not written somewhere on front cover of manual; although did bit.

edit 1:

so seems pdo thing, not mysql. pdo->fetchall() return empty array if result-set zero, , false on error. null? and no column values requesting not null in case silly thought came head.

in detail important function using.

in generally, "false" means error occured.

check out php.net more details.


Comments

Post a Comment

Popular posts from this blog

mysqli - Php Mysqli_fetch_assoc Error : "Warning: Illegal string offset 'name' in" -

-
this question has answer here: php mysqli returns 1 row 3 answers warning: illegal string offset 'name' in c:\xampp\htdocs\connection\index.php on line 31 1", please can me. <?php include('config.php'); $conn = mysqli_connect(db_host, db_user, db_pass, db_name); $sql = "select * users"; $result = mysqli_query($conn, $sql); $rows = mysqli_fetch_assoc($result); ?> and in body tag <?php foreach ($rows $row) { echo $row['name']; }?> you should use mysqli_fetch_all() here rows within $rows @ once. $sql = "select * users"; $result = mysqli_query($conn, $sql) or die(mysqli_error($conn); $rows = mysqli_fetch_all($result); echo "<pre>"; print_r($rows); // check result
Read more

html - Cut text on left side inside button while centering -

-
i need have button text (f.e. "add basket") fluid in width. if button width little show "add basket" must cut "basket" only. did achieve of splitting <span class="text">add basket</span> into 2 parts , reverse order them in dom <span class="text">basket</span><span class="text text-prefix">add to&nbsp;</span> and show them in correct order adding .text{ float: right; } however, text inside button must centered, not work far. here fiddle, i'd appreciate ideas: https://jsfiddle.net/5cavrrhc/ under circumstances, want avoid using js this. solution ok, here go: https://jsfiddle.net/6etabchg/4/ ok, co-worker , found solution works nicely. make button position: relative make wrapper display: flex; flex-wrap: wrap-reverse; justify-content: center; reverse order make both inner spans display: inline-block;flex-shrink: 0; make 1 span should remain or...
Read more

php - Hide Categories from WordPress Dashboard by ID and Custom Post Type -

-
i went searching solution hide specific categories id on wordpress dashboard individual custom post types. stumbled upon following code , able half way there hiding categories logged in user. add_action( 'admin_init', 'wpse_55202_do_terms_exclusion' ); function wpse_55202_do_terms_exclusion() { if( current_user_can('administrator') ) add_filter( 'list_terms_exclusions', 'wpse_55202_list_terms_exclusions', 10, 2 ); } function wpse_55202_list_terms_exclusions($exclusions,$args) { return $exclusions . " , ( t.term_id <> 43 ) , ( t.term_id <> 42 )"; } now want alter code hide id specified categories taking custom post type account. know, can pass argument current_user_can i'm not sure how phrase it. unfortunately custom taxonomy have implemented in other aspects of site not going work in instance. i thought had swap if statement conditional get_post_type did not work. ideas? 'andytoday...
Read more