Quoting issue. Single quotes can't be nested, so foo and pm are unquoted, i.e. interpreted as barewords, and as no such functions exist, they're turned into strings and concatenated by the dot operator.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^5: Remove similar key=value pair from HOH by choroba
in thread Remove similar key=value pair from HOH by vaibhav07

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