Ask God for help, about regular expressions

$str = "fsafsaf<{0}>54a<{1}>u7ygda<{2}>kklaoda<{3}>"; $char = Array (' A1 ', ' A2 ', ' A3 ', ' A4 '); $ Pattern = '/<\{(\d*) \}>/'; $replacement = ' $char [\\1] '; $newstr = Preg_replace ($pattern, $replacement, $STR); echo $ NEWSTR;

I want to replace the <{0}><{1}><{2}><{3}> in the $str with the $char array corresponding to the underlying value, can be replaced by my code above the output of fsafsaf$char[0]54a$ CHAR[1]U7YGDA$CHAR[2]KKLAODA$CHAR[3], did not take the value, on this issue card master, kneeling for guidance.

Reply to discussion (solution)

$pattern = '/<\{(\d*) \}>/e ';

$pattern = '/<\{(\d*) \}>/e ';

Thank you very much, this can be written, you can ask what is the meaning of an e?

Eval calculation expression string

Eval calculation expression string

Understand, thanks again!!

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