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ngmy · Mar 25, 2021 · 1214c04 · 1214c04
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 # PHP Observer
 PHP Observer is a PHP library to implement the [observer pattern](https://en.wikipedia.org/wiki/Observer_pattern).
 
+- Provides the subject and observer interfaces. This allows you to implement the concrete subject and observer classes
+
 [![class-diagram](http://www.plantuml.com/plantuml/png/hL71hfim4BpxArQ80_I9Gw-qHP7w0Jta2mmimPMnK-yIfQhoxxLb38bxoAMSsDtPcPtnYLWwNXSjs5w1BVIMsIumAeS3Ask4a3snamF3UUr_-YRy4G2DLiHVV_I4xeQkWz9kl-I77v9P3dELniUqRk5crHWm8xx76Cjg-bsbpaC8tq7GE37OAHtKjX4d02RhqBD2LVAigEdsgq3IaqAm4BwZrNJhTPICSR7suuT0CqBG4q8PHZV90M4_Dp1yR3ifc7AOfRdWkDLFHl3NAZLLYxhZw4Lv3ZPzrbO7KuEMHF3Tci4XOsB3E_iBw3NsabWo1ieByfc3UXqgIbK4r7bMENlRfdq1uFkhCx1bHg7xvN3_XeTsdXS2-0PbP3e6wJaFyjpx7gzQhXeND4oGUba0JPvNIV7d_prCTExKPOxMioFRDihywpoLKQxfKjQlrjDrnUS2R1DaF1IAJyLkMUII6rRZ5A2Xo58G9y-_Blel)](http://www.plantuml.com/plantuml/uml/hL71hfim4BpxArQ80_I9Gw-qHP7w0Jta2mmimPMnK-yIfQhoxxLb38bxoAMSsDtPcPtnYLWwNXSjs5w1BVIMsIumAeS3Ask4a3snamF3UUr_-YRy4G2DLiHVV_I4xeQkWz9kl-I77v9P3dELniUqRk5crHWm8xx76Cjg-bsbpaC8tq7GE37OAHtKjX4d02RhqBD2LVAigEdsgq3IaqAm4BwZrNJhTPICSR7suuT0CqBG4q8PHZV90M4_Dp1yR3ifc7AOfRdWkDLFHl3NAZLLYxhZw4Lv3ZPzrbO7KuEMHF3Tci4XOsB3E_iBw3NsabWo1ieByfc3UXqgIbK4r7bMENlRfdq1uFkhCx1bHg7xvN3_XeTsdXS2-0PbP3e6wJaFyjpx7gzQhXeND4oGUba0JPvNIV7d_prCTExKPOxMioFRDihywpoLKQxfKjQlrjDrnUS2R1DaF1IAJyLkMUII6rRZ5A2Xo58G9y-_Blel)
 
 ## Requirements