Warning: Invalid argument supplied for foreach() in C: xampp htdocs tccSistreinamento view modulos aluno tmp listAluno.php on line 10

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I need help on this code, does not return the list with the array of fields, I’ve done everything, someone can help, it’s for my tcc to desperate, nothing works

filing cabinet listaluno.php 

<?php
extract($_POST);

$genList = json_decode($obj);
echo($genList)


?>
<table class= "table table-striped">
    <tbody> 
        <thead>

        </thead>

        <?php foreach($genList as $aluno){ ?>

        <?php 
        $scampos = $aluno->StrNome. "|".$aluno->NumMatricula. "|" .$aluno->DtNascimento. "|" .$aluno->NumIdUop; 
        ?>

        <tr campos="<?php echo $scampos; ?>">

            <td><?php echo $aluno->StrNome; ?></td>
            <td><?php echo $aluno->NumMatricula; ?></td>
            <td><?php echo $aluno->DtNascimento; ?></td>
            <td><?php echo $aluno->NumIdUop; ?></td>                        
            <td><a href="#" class="editar_aluno"><span class="glyphicon glyphicon-pencil" title="Editar Aluno"></span></a></td>
            <td><a href="#" class="excluir_aluno"><span class="btTabela glyphicon glyphicon-trash" title="Excluir Aluno"></span></a></td>
        </tr>
    <?php } ?>

    </tbody>
</table>

error

Warning: Invalid argument supplied for foreach() in C:\xampp\htdocs\tccSistreinamento\view\modulos\aluno\tmp\listAluno.php on line 10
php
  • 1

    I suggest you remove your email from the question, this kind of thing attracts all kinds of spam! As to your question, the error refers to a loop foreach malformed, but in the code that posted there is no foreach. That’s all your code listaluno.php?

  • 1

    Put the full foreach in the question as it stands it is not clear the mistake

  • The code that was missing was due to formatting the publication... Welcome Aline, the problem is not in the foreach yes at the time you are sending the form, edit the question and put the form code.

1 answer

1

Probably the data passed on json_decode is not a valid JSON format string, so there must have been some error while decoding and it won’t work.

If the variable $obj is a string, it should contain a format like:

$obj = '{...}';

If it came from a file probably the read file is invalid or this at the wrong address, if $obj came from extract($_POST); this may be a flaw in your HTML form, anyway the problem is the format of JSON.

And another detail, echo does not display the object, only displays number and strings, or __toString, recommend using var_dump

Example test that works

I suppose the form should look like this:

<form action="listaluno.php" method="POST">
    <textarea name="obj">
    [
        {
            "StrNome": "Nome",
            "NumMatricula": 10000,
            "DtNascimento": "10/10/2001",
            "NumIdUop": 1
        },
        {
            "StrNome": "Foo Bar",
            "NumMatricula": 3000,
            "DtNascimento": "10/10/2002",
            "NumIdUop": 2
        }
    ]
    </textarea>
    <button>Enviar</button>
</form>

And then try to click Send, should work, the test resulted in:

browser

Errors in the JSON

Note that there may have been some failure in the format of your JSON, such as an extra comma:

[
    {
        "StrNome": "Nome",
        "NumMatricula": 10000,
        "DtNascimento": "10/10/2001",
        "NumIdUop": 1
    },
    {
        "StrNome": "Foo Bar",
        "NumMatricula": 3000,
        "DtNascimento": "10/10/2002",
        "NumIdUop": 2
    }, <-------------------- Virgula extra
]

If there is any fault and do this:

<?php

$foo = '[
    {
        "StrNome": "Nome",
        "NumMatricula": 10000,
        "DtNascimento": "10/10/2001",
        "NumIdUop": 1
    },
    {
        "StrNome": "Foo Bar",
        "NumMatricula": 3000,
        "DtNascimento": "10/10/2002",
        "NumIdUop": 2
    },
]';

var_dump(json_decode($foo));

Will return this:

NULL

Like debug JSON

In case you are completely sure that your json was in the correct format, then redo your script like this:

<?php
extract($_POST);

$genList = json_decode($obj);

if (!$genList) {
    switch (json_last_error()) {
        case JSON_ERROR_DEPTH:
            echo 'A profundidade máxima da pilha foi excedida';
        break;
        case JSON_ERROR_STATE_MISMATCH:
            echo 'JSON malformado ou inválido';
        break;
        case JSON_ERROR_CTRL_CHAR:
            echo 'Erro de caractere de controle, possivelmente codificado incorretamente';
        break;
        case JSON_ERROR_SYNTAX:
            echo 'Erro de sintaxe';
        break;
        case JSON_ERROR_UTF8:
            echo 'Caractere UTF-8 malformado, codificação possivelmente incorreta';
        break;
        default:
            echo 'Erro desconhecido';
        break;
    }
    exit;
}

var_dump($genList);

?>
<table class= "table table-striped">
    <tbody>
        <thead>

        </thead>

        <?php foreach($genList as $aluno){ ?>

        <?php
        $scampos = $aluno->StrNome. "|".$aluno->NumMatricula. "|" .$aluno->DtNascimento. "|" .$aluno->NumIdUop;
        ?>

        <tr campos="<?php echo $scampos; ?>">

            <td><?php echo $aluno->StrNome; ?></td>
            <td><?php echo $aluno->NumMatricula; ?></td>
            <td><?php echo $aluno->DtNascimento; ?></td>
            <td><?php echo $aluno->NumIdUop; ?></td>
            <td><a href="#" class="editar_aluno"><span class="glyphicon glyphicon-pencil" title="Editar Aluno"></span></a></td>
            <td><a href="#" class="excluir_aluno"><span class="btTabela glyphicon glyphicon-trash" title="Excluir Aluno"></span></a></td>
        </tr>
    <?php } ?>

    </tbody>
</table>

Note: I listed only a few errors, however in PHP7 there are more errors http://php.net/manual/en/function.json-last-error.php

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