boucle for chcek ID précédent et sauter itération si nécessaire

Question

J'ai ce code,

<?php foreach($information as $info) : ?> 
     <option selected="no" value="<?php echo $info['grade_id'];?>" id="<?php echo $info['grade_id'];?>"> 
      <?php echo $info['grade_desc'];?> 
     </option> 
<?php endforeach; ?> 

Fondamentalement, ce que cela ne fait cracher de certaines options pour un menu de sélection, mais parfois les sélectionner des options se dupliqués, est-il façon que je ne crache jamais 1 instance de chaque valeur? En utilisant ce que j'ai déjà dans la boucle for? Certains aiment vérifier que le $info['grade_id'] ne correspond pas au précédent et s'il ignore cette itération?

Ceci est ce que le tableau d'information ressemble,

array(4) { 
    [0]=> 
    array(20) { 
    ["career_id"]=> 
    string(2) "22" 
    ["career_name"]=> 
    string(7) "Builder" 
    ["career_desc"]=> 
    string(293) "Depending on the area of building that you would like to go into will depend on the aspects you will cover. Building covers- Civil Engineering, Electricians, Plunbers, Ground Workers, Brick Layers, Site Supervisors to name but a few. A career in construction can take you into many directions." 
    ["degree_needed"]=> 
    string(2) "No" 
    ["useful_info"]=> 
    NULL 
    ["useful_links"]=> 
    string(45) "http://www.bbcl.co.uk, 
http://www.abe.org.uk" 
    ["salary_id"]=> 
    string(2) "20" 
    ["basic_salary"]=> 
    NULL 
    ["trained_salary"]=> 
    NULL 
    ["progressed_salary"]=> 
    NULL 
    ["average_salary"]=> 
    string(19) "Based on experience" 
    ["careers_career_id"]=> 
    string(2) "22" 
    ["grade_id"]=> 
    string(2) "53" 
    ["grade_desc"]=> 
    string(103) "GCSE grade D in Maths, English and the successful completion of Diploma Level 1 Brickwork or equivalent" 
    ["course_id"]=> 
    string(2) "52" 
    ["course_type"]=> 
    string(24) "Classroom based learning" 
    ["course_names"]=> 
    string(27) "Any combination of A Levels" 
    ["extra_needed"]=> 
    NULL 
    ["course_link"]=> 
    string(55) "http://www.blackburn.ac.uk/sixth_form_as_a2_levels.html" 
    ["grades_grade_id"]=> 
    string(2) "53" 
    } 
    [1]=> 
    array(20) { 
    ["career_id"]=> 
    string(2) "22" 
    ["career_name"]=> 
    string(7) "Builder" 
    ["career_desc"]=> 
    string(293) "Depending on the area of building that you would like to go into will depend on the aspects you will cover. Building covers- Civil Engineering, Electricians, Plunbers, Ground Workers, Brick Layers, Site Supervisors to name but a few. A career in construction can take you into many directions." 
    ["degree_needed"]=> 
    string(2) "No" 
    ["useful_info"]=> 
    NULL 
    ["useful_links"]=> 
    string(45) "http://www.bbcl.co.uk, 
http://www.abe.org.uk" 
    ["salary_id"]=> 
    string(2) "20" 
    ["basic_salary"]=> 
    NULL 
    ["trained_salary"]=> 
    NULL 
    ["progressed_salary"]=> 
    NULL 
    ["average_salary"]=> 
    string(19) "Based on experience" 
    ["careers_career_id"]=> 
    string(2) "22" 
    ["grade_id"]=> 
    string(2) "53" 
    ["grade_desc"]=> 
    string(103) "GCSE grade D in Maths, English and the successful completion of Diploma Level 1 Brickwork or equivalent" 
    ["course_id"]=> 
    string(2) "53" 
    ["course_type"]=> 
    string(24) "Practical based learning" 
    ["course_names"]=> 
    string(19) "Bricklaying Level 2" 
    ["extra_needed"]=> 
    string(3) "Yes" 
    ["course_link"]=> 
    string(45) "http://www.blackburn.ac.uk/bricklaying_2.html" 
    ["grades_grade_id"]=> 
    string(2) "53" 
    } 
    [2]=> 
    array(20) { 
    ["career_id"]=> 
    string(2) "22" 
    ["career_name"]=> 
    string(7) "Builder" 
    ["career_desc"]=> 
    string(293) "Depending on the area of building that you would like to go into will depend on the aspects you will cover. Building covers- Civil Engineering, Electricians, Plunbers, Ground Workers, Brick Layers, Site Supervisors to name but a few. A career in construction can take you into many directions." 
    ["degree_needed"]=> 
    string(2) "No" 
    ["useful_info"]=> 
    NULL 
    ["useful_links"]=> 
    string(45) "http://www.bbcl.co.uk, 
http://www.abe.org.uk" 
    ["salary_id"]=> 
    string(2) "20" 
    ["basic_salary"]=> 
    NULL 
    ["trained_salary"]=> 
    NULL 
    ["progressed_salary"]=> 
    NULL 
    ["average_salary"]=> 
    string(19) "Based on experience" 
    ["careers_career_id"]=> 
    string(2) "22" 
    ["grade_id"]=> 
    string(2) "54" 
    ["grade_desc"]=> 
    string(96) "3 GCSE passes at grade D and above preferably in English, Maths, Science or a Technology subject" 
    ["course_id"]=> 
    string(2) "54" 
    ["course_type"]=> 
    string(16) "learn on the job" 
    ["course_names"]=> 
    string(24) "Apprenticeship Brickwork" 
    ["extra_needed"]=> 
    NULL 
    ["course_link"]=> 
    string(56) "http://www.blackburn.ac.uk/apprentices_construction.html" 
    ["grades_grade_id"]=> 
    string(2) "54" 
    } 
    [3]=> 
    array(20) { 
    ["career_id"]=> 
    string(2) "22" 
    ["career_name"]=> 
    string(7) "Builder" 
    ["career_desc"]=> 
    string(293) "Depending on the area of building that you would like to go into will depend on the aspects you will cover. Building covers- Civil Engineering, Electricians, Plunbers, Ground Workers, Brick Layers, Site Supervisors to name but a few. A career in construction can take you into many directions." 
    ["degree_needed"]=> 
    string(2) "No" 
    ["useful_info"]=> 
    NULL 
    ["useful_links"]=> 
    string(45) "http://www.bbcl.co.uk, 
http://www.abe.org.uk" 
    ["salary_id"]=> 
    string(2) "20" 
    ["basic_salary"]=> 
    NULL 
    ["trained_salary"]=> 
    NULL 
    ["progressed_salary"]=> 
    NULL 
    ["average_salary"]=> 
    string(19) "Based on experience" 
    ["careers_career_id"]=> 
    string(2) "22" 
    ["grade_id"]=> 
    string(2) "55" 
    ["grade_desc"]=> 
    string(164) "Ascentis Entry Level 3 Certificate in Preparation for Employment in Construction Industries 
A Functional Skills Certificate at Entry Level 3 
A PSHE Certificate " 
    ["course_id"]=> 
    string(2) "55" 
    ["course_type"]=> 
    string(24) "Practical based learning" 
    ["course_names"]=> 
    string(78) "Construction - Preparation for Employment in Construction Industries - Level 3" 
    ["extra_needed"]=> 
    NULL 
    ["course_link"]=> 
    string(74) "http://www.blackburn.ac.uk/preparation_for_employment_in_construction.html" 
    ["grades_grade_id"]=> 
    string(2) "55" 
    } 
} 

Vous pouvez voir dans la sortie il y a 2 [grade_desc] le même grade GCSE D en mathématiques, l'anglais et la réussite du diplôme de niveau 1 Brickwork ou équivalent. Cependant, il n'y a qu'un seul enregistrement dans la base de données, puis-je supprimer les données répétées du tableau?

Answer 1

essayer

foreach(array_unique($information) as $info) 

plus, prêter attention aux commentaires de Ross: il pourrait être préférable d'optimiser votre requête db en premier lieu

plus, les noms de variables "$ d'information" et "$ info" juste suce. J'espère que ce n'est qu'un exemple!

Answer 2

utilisation array_unique sur $ des informations variables avant de l'utiliser dans le foreach.

exemple:

<?php 
$input = array("a" => "green", "red", "b" => "green", "blue", "red"); 
$result = array_unique($input); 
print_r($result); 
?> 

Check above code

Answer 3

Utilisez une variable supplémentaire où vous stockez le dernier ID de qualité:

$lastGradeID = null; 
foreach ($information as $info) : 
    if ($lastGradeID !== $info['grade_id']) : 
?> 
… 
<?php 
    endif; 
    $lastGradeID = $info['grade_id']; 
endforeach;