Description:
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The mssql_bind function documentation states:

===
$var - The PHP variable you'll bind the MSSQL parameter to. You can pass it by value, or by reference, to retrieve OUTPUT and RETVAL values after the procedure execution.
===

If the value is bound by value, it a random chunk of memory to be bound as the value.

I am using the latest TDS stable, using TDS version 8.0 talking to a Microsoft SQL 2000 Server.

Reproduce code:
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$value = 'Test';
$proc = mssql_init('myProc');
mssql_bind($proc, '@myVal', $value, SQLVARCHAR, false, false, 50);
var_dump(mssql_execute($proc));

Expected result:
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The database should receive the following command:

exec myProc @myVal = 'Test'

Actual result:
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The database server receives the following command:

exec myProc @myVal = ';?e