, PHP replaces the string at the specified position

Online, urgent. PHP replaces the string $ a & nbsp; 36, 0.00, 0.00, 100 | 37, 0.00, 0.00, 100 | 38, 0.00, 0.00, 100 | 39, 0.00, 0.00, 100; $ b38; $ c85; how can I replace it with PHP... & Nbsp; that is, & nbsp; after $ a contains the number of words in $ B. & Nbsp; put 38, online, etc., urgent. PHP replaces the string at the specified position

$ A = '36, 0.00, 0.00, 100 | 37, 0.00, 0.00, 100 | 38, 0.00, 0.00, 100 | 39, 0.00, 0.00, 100 ';
$ B = '38 ';
$ C = '85 ';

How to replace it with PHP...

That is to say, when $ a contains the words in $ B. Replace 0.00 in 38, 0.00, 100, and 100 with a number in $ c.

If $ B = '37'

Replace 0.00 in 37, 0.00, 100, and 100 with a number in $ c.


Thank you!
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Through php5.3 +

$ A = '36, 0.00, 0.00, 100
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37, 0.00, 0.00, 100
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38, 0.00, 0.00, 100
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39, 0.00, 0.00, 100 ';
$ B = '38 ';
$ C = '85 ';

Echo preg_replace_callback ("/(^
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\
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$ B, 0.00, 0.00,) 100/", function ($ m) use ($ c) {return $ m [1]. $ c ;}, $ );

36, 0.00, 0.00, 100
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37, 0.00, 0.00, 100
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38, 0.00, 0.00, 85
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39, 0.00, 0.00, 100