I'm looking for a way to check if two arrays are identical, for example
$a = array(
'1' => 12,
'3' => 14,
'6' => 11
);
$b = array(
'1' => 12,
'3' => 14,
'6' => 11
);
These two would be identical, but if a single value was changed, it would return false, I know I could write a function, but is there one already built?
You can just use $a == $b if order doesn't matter, or $a === $b if order does matter.
For example:
$a = array(
'1' => 12,
'3' => 14,
'6' => 11
);
$b = array(
'1' => 12,
'3' => 14,
'6' => 11
);
$c = array(
'3' => 14,
'1' => 12,
'6' => 11
);
$d = array(
'1' => 11,
'3' => 14,
'6' => 11
);
$a == $b; // evaluates to true
$a === $b; // evaluates to true
$a == $c; // evaluates to true
$a === $c; // evaluates to false
$a == $d; // evaluates to false
$a === $d; // evaluates to false
You can use
$a === $b // or $a == $b
example of usage:
<?php
$a = array(
'1' => 12,
'3' => 14,
'6' => 11
);
$b = array(
'1' => 12,
'3' => 14,
'6' => 11
);
echo ($a === $b) ? 'they\'re same' : 'they\'re different';
echo "\n";
$b['1'] = 11;
echo ($a === $b) ? 'they\'re same' : 'they\'re different';
which will return
they're same
they're different
array_diff does not work very well for checking for "identical arrays." It also has a premise that the keys will not change. Adding another key, with one of the existing values, will not work with array_diff, also adding a value to the first array or the second array gives different results.
array_diff() which can be misleading, try this: $a = array('x' => true, 'y' => false); $b = array('x' => true, 'y' => true, 'z' => false); print_r(array_diff($a,$b)); Clearly they are not identical, but array_diff shows no differences.
===?