php - Why does msyqli_real_escape_string() not escape multiple backslashes properly? -

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given sql

update `mytable`  set `mycolumn`='karla bailey-pearapppppppp\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\'  `id`=5619

why mysqli_real_escape_string() not escape string properly?

trying use sql query after escaping column's value produces mysqli error:

"you have error in sql syntax; check manual corresponds mysql server version right syntax use near ''karla bailey-pearapppppppp\\\\\\\\\\\\\\\\\\\\\\\\\\\' @ line 3"

is there limit number of backslashes can escaped?

are escaping entire string? e.g.

$sql = "update .... \\\\\\\'"; $escaped = mysqli_real_escape_string($link, $sql);

if so, that's incorrect. trashing string doing that. you'll escaping ' delimit clause value. escaping should performed values you're inserting string. e.g.

$name = "miles o'brien"; // ' in name cause syntax error $bad_sql = "select '$name'"; $broken_sql = mysqli_real_escape_string($link, $bad_sql); // produces: select \'miles o\'brien\'   $ok_sql = "select '" . mysqli_real_escape_string($link, $name) . "'"; // produces: select 'miles o\'brien';

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