I have a PHP file that tries to echo a $_POST and I get an error, here is the code:
echo "<html>";
echo "<body>";
for($i=0; $i<5;$i++){
echo "<input name='C[]' value='$Texting[$i]' " .
"style='background-color:#D0A9F5;'></input>";
}
echo "</body>";
echo "</html>";
echo '<input type="submit" value="Save The Table" name="G"></input>'
Here is the code to echo the POST.
if(!empty($_POST['G'])){
echo $_POST['C'];
}
But when the code runs I get an error like:
Notice: Array to string conversion in
C:\xampp\htdocs\PHIS\FinalSubmissionOfTheFormPHP.php on line 8
What does this error mean and how do I fix it?
Array to string conversion in latest versions of php 7.x is error, rather than notice, and prevents further code execution.
Using print, echo on array is not an option anymore.
Suppressing errors and notices is not a good practice, especially when in development environment and still debugging code.
Use var_dump,print_r, iterate through input value using foreach or for to output input data for names that are declared as input arrays ('name[]')
Most common practice to catch errors is using try/catch blocks, that helps us prevent interruption of code execution that might cause possible errors wrapped within try block.
try{ //wrap around possible cause of error or notice
if(!empty($_POST['C'])){
echo $_POST['C'];
}
}catch(Exception $e){
//handle the error message $e->getMessage();
}
You are using <input name='C[]' in your HTML. This creates an array in PHP when the form is sent.
You are using echo $_POST['C']; to echo that array - this will not work, but instead emit that notice and the word "Array".
Depending on what you did with the rest of the code, you should probably use echo $_POST['C'][0];
If you send a PHP array into a function that expects a string like: echo or print, then the PHP interpreter will convert your array to the literal string Array, throw this Notice and keep going. For example:
php> print(array(1,2,3))
PHP Notice: Array to string conversion in
/usr/local/lib/python2.7/dist-packages/phpsh/phpsh.php(591) :
eval()'d code on line 1
Array
In this case, the function print dumps the literal string: Array to stdout and then logs the Notice to stderr and keeps going.
Another example in a PHP script:
<?php
$stuff = array(1,2,3);
print $stuff; //PHP Notice: Array to string conversion in yourfile on line 3
?>
$stuff = array(1,2,3);
foreach ($stuff as $value) {
echo $value, "\n";
}
Prints:
1
2
3
Or along with array keys
$stuff = array('name' => 'Joe', 'email' => '[email protected]');
foreach ($stuff as $key => $value) {
echo "$key: $value\n";
}
Prints:
name: Joe
email: [email protected]
Note that array elements could be arrays as well. In this case either use foreach again or access this inner array elements using array syntax, e.g. $row['name']
In case it's just a plain 1-demensional array, you can simply join all the cells into a string using a delimiter:
<?php
$stuff = array(1,2,3);
print implode(", ", $stuff); //prints 1, 2, 3
print join(',', $stuff); //prints 1,2,3
In case your array has a complex structure but you need to convert it to a string anyway, then use http://php.net/json_encode
$stuff = array('name' => 'Joe', 'email' => '[email protected]');
print json_encode($stuff);
Prints
{"name":"Joe","email":"[email protected]"}
If you want just to inspect the array contents for the debugging purpose, use one of the following functions. Keep in mind that var_dump is most informative of them and thus usually being preferred for the purpose
examples
$stuff = array(1,2,3);
print_r($stuff);
$stuff = array(3,4,5);
var_dump($stuff);
Prints:
Array
(
[0] => 1
[1] => 2
[2] => 3
)
array(3) {
[0]=>
int(3)
[1]=>
int(4)
[2]=>
int(5)
}
<?php
ob_start();
var_dump($_POST['C']);
$result = ob_get_clean();
?>
if you want to capture the result in a variable
Source: Stackoverflow.com