<?php
$a1=['0'=>'my key should be a (numeric) string'];
$a2=[0=>'my key should be an int'];
$a3= new stdClass;
$a3->{"0"} = 'my key should be a (numeric) string';
$a3=(array)$a3;
foreach($a1 as $key=>$val){echo $val.': ';var_dump($key);}
foreach($a2 as $key=>$val){echo $val.': ';var_dump($key);}
foreach($a3 as $key=>$val){echo $val.': ';var_dump($key);}
var_dump($a1,$a2,$a3);
my key should be a (numeric) string: int(0)
my key should be an int: int(0)
my key should be a (numeric) string: int(0)
array(1) {
[0]=>
string(35) "my key should be a (numeric) string"
}
array(1) {
[0]=>
string(23) "my key should be an int"
}
array(1) {
[0]=>
string(35) "my key should be a (numeric) string"
}
Output for 8.3.5
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
my key should be a (numeric) string: int(0)
my key should be an int: int(0)
my key should be a (numeric) string: int(0)
array(1) {
[0]=>
string(35) "my key should be a (numeric) string"
}
array(1) {
[0]=>
string(23) "my key should be an int"
}
array(1) {
[0]=>
string(35) "my key should be a (numeric) string"
}
my key should be a (numeric) string: int(0)
my key should be an int: int(0)
my key should be a (numeric) string: string(1) "0"
array(1) {
[0]=>
string(35) "my key should be a (numeric) string"
}
array(1) {
[0]=>
string(23) "my key should be an int"
}
array(1) {
["0"]=>
string(35) "my key should be a (numeric) string"
}