PHP MySQL insert file, validating form with IF-statement with OR operator -


i brand new php , not sure if technique practice, code worked until added || (!is_numeric($variable)) portions of if-statements.

i tested code inserting letters number fields ensuring length of string correct. when do, code runs else-statement , echos ".$jname."added.....etc"". mysqli_query commented out testing. have tried different versions more or less parenthesis.

why won't is_numeric() catch letters? allowed multiple ! arguments in if-statement?

<?php     header('refresh: 3; url=../job_table.php');     require 'connect.php';       $jname = mysqli_real_escape_string($db,$_post['field1']);     $jname_length = 25;     $jwo = mysqli_real_escape_string($db,$_post['field2']);     $jwo_length = 7;     $jpo = mysqli_real_escape_string($db,$_post['field3']);     $jpo_length = 4;     $add_job_query = "insert jobs (name, wo_no, po_no) values ('$jname','$jwo','$jpo')";     if(($jname || $jwo || $jpo ) == "") {         echo "<center><h1>please fill fields!</h1></center>";     } elseif(!(strlen($jname) <= $jname_length)) {         echo "<center><h1>name must less or equal ".$jname_length." characters!</h1></center>";     } elseif((strlen($jwo) != $jwo_length) || (!is_numeric($jwo))) {         echo "<center><h1>wo number must ".$jwo_length." digit number!</h1></center>";     } elseif((strlen($jpo) != $jpo_length) || (!is_numeric($jwo))) {         echo "<center><h1>po number must ".$jpo_length." digit number!</h1></center>";     } else {         //echo mysqli_query($db,$add_job_query);         echo "<center><h1>".$jname." added!</h1><h1>wo number:".$jwo."</h1><h1>po number:".$jpo."</h1></center>";     }     echo "<center><h1>please wait.</h1></center>"; ?>

seems me need instead.

if(empty($jname) || empty($jwo) || empty($jpo)){     echo "<center><h1>please fill fields!</h1></center>"; }elseif($jname <= $jname_length){     echo "<center><h1>name must less or equal ".$jname_length." characters!</h1></center>"; }elseif(($jwo != $jwo_length) || (!is_numeric($jwo))){     echo "<center><h1>wo number must ".$jwo_length." digit number!</h1></center>"; }elseif(($jpo != $jpo_length) || (!is_numeric($jwo))){     echo "<center><h1>po number must ".$jpo_length." digit number!</h1></center>"; }else{     //echo mysqli_query($db,$add_job_query);     echo "<center><h1>".$jname." added!</h1><h1>wo number:".$jwo."</h1><h1>po number:".$jpo."</h1></center>"; }

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