Unicode
1
No errors expected at this point
2
strlen
3
substr (at zero offset)
4
substr (at zero offset RTL-language)
5
substr (non-zero offset)
6
substr (empty string)
7
substr (negative offset)
8
substr (negative offset and specified length)
9
strpos
10
strpos with offset
11
strstr (before needle)
12
strstr (after needle)
13
substr_count
14
ltrim
15
rtrim
16
trim
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