I want to change a specific character. But the order isn't exact and not only the first one. Here is the variable examples:
There are 1000 variables like this. I just want to change all second "_" characters. The result must be like this:
I've tried substr and str_replace but I couldn't understand how to do.
Can someone please show me a way to achieve this :)
If the second one is always the last one, you can use strrpos.
<?php
$vals = [
'123_456_789.jpg',
'3210_5325_aa.jpg',
'54321-0888_555_1111.jpg'
];
foreach ($vals as $val) {
$pos = strrpos($val, '_');
echo substr($val, 0, $pos) . 'x' . substr($val, $pos + 1) . '<BR>';
}
// 123_456x789.jpg
// 3210_5325xaa.jpg
// 54321-0888_555x1111.jpg
If it should be really the second one occurence (independently of real number of occurences), it could be:
<?php
$vals = [
'123_456_789.jpg',
'3210_5325_aa.jpg',
'54321-0888_555_1111_32.jpg'
];
foreach ($vals as $val) {
$pos = strpos($val, '_'); // 1st '_'
$pos2 = strpos($val, '_', $pos + 1); // 2nd '_'
echo substr($val, 0, $pos2) . 'x' . substr($val, $pos2 + 1) . '<BR>';
}
// 123_456x789.jpg
// 3210_5325xaa.jpg
// 54321-0888_555x1111_32.jpg
The second variant is regex, of course. I've showed you strpos/strrpos variants due to the question.