validate my form and header to another success page

[Yousef Altaf]

I am trying to validate my form fields and redirect the user to success page

so this is the PHP code

if (empty($_POST['experiences'])) {
        $error['experiencesErr'] = "Experiences Required";
    } else {
        $experiences = check_input($_POST['experiences']);
        if (!preg_match("/^[0-9_a-zA-Z ]*$/", $experiences)) {
            $error['experiencesErr'] = "Only letters, numbers and '_' allowed";
        }
    }
 
    $courses = check_input($_POST['courses']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $courses)) {
        $error['coursesErr'] = "Only letters, numbers and '_' allowed";
    }
 
    $careerObjective = check_input($_POST['careerObjective']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $careerObjective)) {
        $error['careerObjectiveErr'] = "Only letters, numbers and '_' allowed";
    }
 
    if (empty($_POST['availability'])) {
        $error['availabilityErr'] = "Availability Required";
    } else {
        $availability = check_input($_POST['availability']);
    }
 
    if (empty($_POST['typeOfJob'])) {
        $error['typeOfJobErr'] = "Full/Part Time Required";
    } else {
        $typeOfJob = check_input($_POST['typeOfJob']);
    }
 
    if (empty($_POST['typeOfJob'])) {
        $error['typeOfJobErr'] = "Full/Part Time Required";
    } else {
        $typeOfJob = check_input($_POST['typeOfJob']);
    }
 
    if (empty($_POST['rank'])) {
        $error['rankErr'] = "Self-assessment Required";
    } else {
        $rank = check_input($_POST['rank']);
    }
 
    if (empty($_POST['jTitle'])) {
        $error['jTitleErr'] = "Job Field Required";
    } else {
        $jTitle = check_input($_POST['jTitle']);
    }
 
    $otherJobTitle = check_input($_POST['otherJobTitle']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $otherJobTitle)) {
        $error['otherJobTitleErr'] = "Only letters, numbers and '_' allowed";
    }
 
    if (empty($_POST['salaryRange'])) {
        $error['salaryRangeErr'] = "Salary Range Required";
    } else {
        $salaryRange = check_input($_POST['salaryRange']);
    }
 
    if (empty($_POST['currency'])) {
        $error['currencyErr'] = "Currency Required";
    } else {
        $currency = check_input($_POST['currency']);
    }
 
    $workIn = check_input($_POST['workIn']);
 
    if(!$error){
        $putData = $db->prepare("INSERT INTO hired_ts_info (id, uid, experiences, courses, career_objective,
        availability, type_of_job, rank, job_title, other_job_title, salary_range, currency, workIn)
        VALUES(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
 
        $putData->bind_param('iisssssssssss', $id, $uid, $experiences, $courses, $careerObjective, $availability,
        $typeOfJob, $rank, $jTitle, $otherJobTitle, $salaryRange, $currency, $workIn);
 
        if($putData->execute()){
            header("Location:?pid=4&pp=2&pps=technicalSummary&m=g");
        }else{
            echo "Error on executing";
        }
    }
}
?>
 

and this is the first lines of the HTML code

<form action="<?php $_SERVER['PHP_SELF']; ?>" method="post" id="personRegestrationPage4">
 
 
<div class="f_left width100percent">
    <div class="TwoLine">
        <label for="experiences" class="requiredFields">experiences and qualifications</label>
        <textarea name="experiences" id="experiences"></textarea>
        <span class="notAllowed"><?php if (isset($error)) {
                echo $error['experiencesErr'];
            }?></span>
    </div>
 
    <div class="TwoLine">
        <label for="courses">Previous Courses</label>
        <textarea name="courses" id="courses"></textarea>
        <span class="notAllowed"><?php if (isset($error)) {
                echo $error['coursesErr'];
            } ?></span>
    </div>
</div>
 

and this is the submit button code

<input type="submit" name="subTs" id="subTs" value="Save Changes" class="submitBtn4">

Update

<?php
 
error_reporting(E_ALL);
ini_set('display_errors', 1);
 
 
$experiences = $courses = $careerObjective = $availability = $typeOfJob = $rank = $jTitle = $otherJobTitle
    = $salaryRange = $currency = $workIn = "";
 
$experiencesErr = $coursesErr = $careerObjectiveErr = $availabilityErr = $typeOfJobErr = $rankErr = $jTitleErr
    = $otherJobTitleErr = $salaryRangeErr = $currencyErr = $workInErr = "";
 
 
$id = "";
$uid = "";
 
if ($_SERVER['REQUEST_METHOD'] == "POST") {
    $error = array();
 
    if (empty($_POST['experiences'])) {
        $error['experiencesErr'] = "Experiences Required";
    } else {
        $experiences = check_input($_POST['experiences']);
        if (!preg_match("/^[0-9_a-zA-Z ]*$/", $experiences)) {
            $error['experiencesErr'] = "Only letters, numbers and '_' allowed";
        }
    }
 
    $courses = check_input($_POST['courses']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $courses)) {
        $error['coursesErr'] = "Only letters, numbers and '_' allowed";
    }
 
    $careerObjective = check_input($_POST['careerObjective']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $careerObjective)) {
        $error['careerObjectiveErr'] = "Only letters, numbers and '_' allowed";
    }
 
    if (empty($_POST['availability'])) {
        $error['availabilityErr'] = "Availability Required";
    } else {
        $availability = check_input($_POST['availability']);
    }
 
    if (empty($_POST['typeOfJob'])) {
        $error['typeOfJobErr'] = "Full/Part Time Required";
    } else {
        $typeOfJob = check_input($_POST['typeOfJob']);
    }
 
    if (empty($_POST['typeOfJob'])) {
        $error['typeOfJobErr'] = "Full/Part Time Required";
    } else {
        $typeOfJob = check_input($_POST['typeOfJob']);
    }
 
    if (empty($_POST['rank'])) {
        $error['rankErr'] = "Self-assessment Required";
    } else {
        $rank = check_input($_POST['rank']);
    }
 
    if (empty($_POST['jTitle'])) {
        $error['jTitleErr'] = "Job Field Required";
    } else {
        $jTitle = check_input($_POST['jTitle']);
    }
 
    $otherJobTitle = check_input($_POST['otherJobTitle']);
    if (!preg_match("/^[0-9_a-zA-Z ]*$/", $otherJobTitle)) {
        $error['otherJobTitleErr'] = "Only letters, numbers and '_' allowed";
    }
 
    if (empty($_POST['salaryRange'])) {
        $error['salaryRangeErr'] = "Salary Range Required";
    } else {
        $salaryRange = check_input($_POST['salaryRange']);
    }
 
    if (empty($_POST['currency'])) {
        $error['currencyErr'] = "Currency Required";
    } else {
        $currency = check_input($_POST['currency']);
    }
 
    $workIn = check_input($_POST['workIn']);
 
    if (!$error) {
        $putData = $db->prepare("INSERT INTO hired_ts_info (id, uid, experiences, courses, career_objective,
        availability, type_of_job, rank, job_title, other_job_title, salary_range, currency, workIn)
        VALUE(?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)");
 
        $putData->bind_param('iisssssssssss', $id, $uid, $experiences, $courses, $careerObjective, $availability,
            $typeOfJob, $rank, $jTitle, $otherJobTitle, $salaryRange, $currency, $workIn);
 
        if ($putData->execute()) {
            header("Location:?pid=4&pp=2&pps=technicalSummary&m=g");
        } else {
            echo "Error on executing";
        }
    } else {
        $error = array(
            "coursesErr" => "",
            "careerObjectiveErr" => "",
            "otherJobTitleErr" => "",
            "experiencesErr" => "",
            "availabilityErr" => "",
            "typeOfJobErr" => "",
            "rankErr" => "",
            "jTitleErr" => "",
            "salaryRangeErr" => "",
            "currencyErr" => "",
        );
    }
}
?>
 

**still that didn't solve the issue **
1- now the code submit correctly and gos to my DB.
2- if the fields is empty or not allowed input the message don't appear any more under the fields
any Ideas please

Thanks