PHP - Check variable is defined

Test whether a variable exists and is defined.

Variable name
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498

Check using isset

Checks whether variable is set and is not NULL.

if (isset({{name}})) {
    {{defined_body}}
} else {
    {{undefined_body}}
}
php

Notes

  • Considers variable set to NULL as defined.

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498

Checks for key in defined vars array.

Get local and global defined vars and check for key existence.

array_key_exists('{{name}}', get_defined_vars())
php

Notes

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