language/variables.xml
5700871f9d037a59d137be318f89deb7e146bbf6
5700871f9d037a59d137be318f89deb7e146bbf6
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@@ -138,7 +138,7 @@ $bar = &test(); // Invalid.
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var_dump($unset_var);
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// Boolean usage; outputs 'false' (See ternary operators for more on this syntax)
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echo($unset_bool ? "true\n" : "false\n");
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echo $unset_bool ? "true\n" : "false\n";
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// String usage; outputs 'string(3) "abc"'
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$unset_str .= 'abc';
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@@ -148,7 +148,7 @@ var_dump($unset_str);
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$unset_int += 25; // 0 + 25 => 25
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var_dump($unset_int);
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// Float/double usage; outputs 'float(1.25)'
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// Float usage; outputs 'float(1.25)'
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$unset_float += 1.25;
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var_dump($unset_float);
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@@ -169,7 +169,8 @@ var_dump($unset_obj);
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Relying on the default value of an uninitialized variable is problematic
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in the case of including one file into another which uses the same
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variable name.
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<link linkend="errorfunc.constants.errorlevels.e-notice">E_NOTICE</link> level error is issued in case of
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<constant>E_WARNING</constant> (prior to PHP 8.0.0, <constant>E_NOTICE</constant>)
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level error is issued in case of
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working with uninitialized variables, however not in the case of appending
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elements to the uninitialized array. <function>isset</function> language
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construct can be used to detect if a variable has been already initialized.
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@@ -225,8 +226,8 @@ var_dump($unset_obj);
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<simpara>
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The scope of a variable is the context within which it is defined.
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For the most part all PHP variables only have a single scope.
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This single scope spans included and required files as well. For
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example:
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This single scope spans <function>include</function>d and
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<function>require</function>d files as well. For example:
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</simpara>
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<informalexample>
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<programlisting role="php">
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@@ -264,7 +265,12 @@ test();
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</informalexample>
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<simpara>
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This script will not produce any output because the echo statement
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This script will generate an undefined variable <constant>E_WARNING</constant>
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(or a <constant>E_NOTICE</constant> prior to PHP 8.0.0)
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diagnostic. However, if the
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<link linkend="ini.display-errors">display_errors</link> INI setting is set to hide
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such diagnostics then nothing at all will be outputted.
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This is because the echo statement
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refers to a local version of the <varname>$a</varname> variable,
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and it has not been assigned a value within this scope. You may
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notice that this is a little bit different from the C language in
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@@ -541,13 +547,13 @@ var_dump(Bar::counter()); // int(4), prior to PHP 8.1.0 int(2)
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<?php
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function test_global_ref() {
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global $obj;
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$new = new stdclass;
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$new = new stdClass;
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$obj = &$new;
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}
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function test_global_noref() {
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global $obj;
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$new = new stdclass;
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$new = new stdClass;
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$obj = $new;
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}
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@@ -585,7 +591,7 @@ function &get_instance_ref() {
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echo 'Static object: ';
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var_dump($obj);
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if (!isset($obj)) {
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$new = new stdclass;
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$new = new stdClass;
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// Assign a reference to the static variable
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$obj = &$new;
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}
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@@ -603,7 +609,7 @@ function &get_instance_noref() {
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echo 'Static object: ';
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var_dump($obj);
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if (!isset($obj)) {
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$new = new stdclass;
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$new = new stdClass;
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// Assign the object to the static variable
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$obj = $new;
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}
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@@ -693,7 +699,7 @@ $$a = 'world';
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<programlisting role="php">
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<![CDATA[
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<?php
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echo "$a ${$a}";
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echo "$a {$$a}";
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?>
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]]>
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</programlisting>
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