How php converts strings to bool types

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Operating environment of this tutorial: windows7 system, PHP7.1 version, DELL G3 computer

Method 1: add the target type (bool) or (boolean) enclosed in parentheses before the string variable to be converted

Output result:

Method 2: use the boolval () function

Boolval (): used to get the Boolean value of the variable

Output result:

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