Description:
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strip string result for string contain numeric value not true;

this below code show it.

Test script:
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echo "<br/>test ltrim: 05039 <br/>";
echo ltrim("05039", "05");

echo "<br/>test rtrim: 345030 <br/>";
echo rtrim("345030", "30");

Expected result:
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test ltrim: 05039 
039

test rtrim: 345030
3450

Actual result:
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test ltrim: 05039 
39

test rtrim: 345030
345