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PHP Spotting References
Introduction
Many syntax constructs in PHP are implemented via referencing mechanisms. If reference to a global variable is unset in a function, the same variable in global namespace is not removed.
Example
<?php
$var1 = 'Hello World';
function myfunction(){
global $var1;
$var2 =&$var1;
echo "$var1, $var2
";
$var2="Hello PHP";
echo "$var1, $var2
";
unset($var1);
}
myfunction();
echo "$var1
";
?>Output
Global $va1 is intact.
Hello World, Hello World Hello PHP, Hello PHP Hello PHP
debug_zval_dump() function can be used if a variable has references to other variables
Updated on: 18-Sep-2020
131 Views
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