Web Reference: Mar 10, 2021 · This error means that you are trying to access the index [1] ['size'] of the string, which is not valid. Be sure to check that uploadSingleFile(...) is returning you an array and not a string. Introduction ¶ A TypeError may be thrown when: The value being set for a class property does not match the property's corresponding declared type. The argument type being passed to a function does not match its corresponding declared parameter type. A value being returned from a function does not match the declared function return type. Jan 16, 2026 · In PHP 8.0+, it is elevated to a `TypeError`, halting execution. This blog will demystify this error, explain why it occurs, walk through common scenarios, and provide actionable solutions to fix and prevent it.
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