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Clarify the uniqueness and stability of casting resources to string/integer.

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It was pointed out on comp.lang.php that the existing wording was unclear on
the point of what in the resource->string casting behaviour shouldn't be relied
upon (whether it was not guaranteed that the string is unique, or just that the
exact format of the string is subject to change). I've also added a paragraph
to the integer page noting what a resource->integer cast results in.


git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@332894 c90b9560-bf6c-de11-be94-00142212c4b1
This commit is contained in:
Adam Harvey 2014-02-26 21:23:36 +00:00
parent bd34864223
commit 7c2c57dddc
2 changed files with 13 additions and 5 deletions
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6
language/types/integer.xml
View file

@ -197,6 +197,12 @@ var_dump(round(25/7)); // float(4)
<type>integer</type> with the <function>intval</function> function.
</simpara>
<simpara>
If a <type>resource</type> is converted to an <type>integer</type>, then
the result will be the unique resource number assigned to the
<type>resource</type> by PHP at runtime.
</simpara>
<simpara>
See also <link linkend="language.types.type-juggling">Type Juggling</link>.
</simpara>

12
language/types/string.xml
View file

@ -960,11 +960,13 @@ bool(false)
<para>
<type>Resource</type>s are always converted to <type>string</type>s with the
structure <literal>"Resource id #1"</literal>, where <literal>1</literal> is
the unique number assigned to the <type>resource</type> by PHP at runtime. Do
not rely upon this structure; it is subject to change. To get a
<type>resource</type>'s type, use the
<function>get_resource_type</function> function.
structure <literal>"Resource id #1"</literal>, where <literal>1</literal>
is the resource number assigned to the <type>resource</type> by PHP at
runtime. While the exact structure of this string should not be relied on
and is subject to change, it will always be unique for a given resource
within the lifetime of a script being executed (ie a Web request or CLI
process) and won't be reused. To get a <type>resource</type>'s type, use
the <function>get_resource_type</function> function.
</para>
<para>