P粉9868609502023-08-22 09:46:05
The meaning of PHP Notice and how to reproduce it:
If you pass a PHP array to a function that expects a string, such as echo or print, then the PHP interpreter will convert your array to a literal stringArray, throw this Notice and continue execution. 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 outputs the literal string Array to stdout, then logs the Notice to stderr and continues execution.
Another PHP script example:
<?php
$stuff = array(1,2,3);
print $stuff; //PHP Notice: Array to string conversion in yourfile on line 3
?>
Correction method 1: Use foreach loop to access array elements
http://php.net/foreach
$stuff = array(1,2,3);
foreach ($stuff as $value) {
echo $value, "\n";
}
Output:
1
2
3
Or contain array key name:
$stuff = array('name' => 'Joe', 'email' => 'joe@example.com');
foreach ($stuff as $key => $value) {
echo "$key: $value\n";
}
Output:
name: Joe
email: joe@example.com
Note that array elements can also be arrays. In this case, you can use foreach again or use array syntax to access the inner array elements, like $row['name']
Correction method 2: Connect all cells in the array together:
If it is just an ordinary one-dimensional array, you can use the delimiter to concatenate all cells into a string:
<?php
$stuff = array(1,2,3);
print implode(", ", $stuff); //输出 1, 2, 3
print join(',', $stuff); //输出 1,2,3
Correction method 3: Convert array of complex structure to string:
If your array has a complex structure but still need to convert it to a string, you can use http://php.net/json_encode
$stuff = array('name' => 'Joe', 'email' => 'joe@example.com');
print json_encode($stuff);
Output:
{"name":"Joe","email":"joe@example.com"}
Quickly view the array structure: use the built-in php function
If you just want to inspect the array contents for debugging purposes, you can use one of the following functions. Keep in mind that var_dump is the most verbose of them all and is usually preferred for this purpose
Example:
$stuff = array(1,2,3);
print_r($stuff);
$stuff = array(3,4,5);
var_dump($stuff);
Output:
Array
(
[0] => 1
[1] => 2
[2] => 3
)
array(3) {
[0]=>
int(3)
[1]=>
int(4)
[2]=>
int(5)
}reply
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